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Naka S, Ooe K, Shirakami Y, Kurimoto K, Sakai T, Takahashi K, Toyoshima A, Wang Y, Haba H, Kato H, Tomiyama N, Watabe T. Production of [ 211At]NaAt solution under GMP compliance for investigator-initiated clinical trial. EJNMMI Radiopharm Chem 2024; 9:29. [PMID: 38619655 PMCID: PMC11018728 DOI: 10.1186/s41181-024-00257-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 03/21/2024] [Indexed: 04/16/2024] Open
Abstract
BACKGROUND The alpha emitter astatine-211 (211At) is garnering attention as a novel targeted alpha therapy for patients with refractory thyroid cancer resistant to conventional therapy using beta emitter radioiodine (131I). Herein, we aimed to establish a robust method for the manufacturing and quality control of [211At]NaAt solution for intravenous administration under the good manufacturing practice guidelines for investigational products to conduct an investigator-initiated clinical trial. RESULTS 211At was separated and purified via dry distillation using irradiated Bi plates containing 211At obtained by the nuclear reaction of 209Bi(4He, 2n)211At. After purification, the 211At trapped in the cold trap was collected in a reaction vessel using 15 mL recovery solution (1% ascorbic acid and 2.3% sodium hydrogen carbonate). After stirring the 211At solution for 1 h inside a closed system, the reaction solution was passed through a sterile 0.22 μm filter placed in a Grade A controlled area and collected in a product vial to prepare the [211At]NaAt solution. According to the 3-lot tests, decay collected radioactivity and radiochemical yield of [211At]NaAt were 78.8 ± 6.0 MBq and 40 ± 3%, respectively. The radiochemical purity of [211At]At- obtained via ion-pair chromatography at the end of synthesis (EOS) was 97 ± 1%, and remained > 96% 6 h after EOS; it was detected at a retention time (RT) 3.2-3.3 min + RT of I-. LC-MS analysis indicated that this principal peak corresponded with an astatide ion (m/z = 210.988046). In gamma-ray spectrometry, the 211At-related peaks were identified (X-ray: 76.9, 79.3, 89.3, 89.8, and 92.3 keV; γ-ray: 569.7 and 687.0 keV), whereas the peak at 245.31 keV derived from 210At was not detected during the 22 h continuous measurement. The target material, Bi, was below the 9 ng/mL detection limit in all lots of the finished product. The pH of the [211At]NaAt solution was 7.9-8.6; the concentration of ascorbic acid was 9-10 mg/mL. Other quality control tests, including endotoxin and sterility tests, confirmed that the [211At]NaAt solution met all quality standards. CONCLUSIONS We successfully established a stable method of [211At]NaAt solution that can be administered to humans intravenously as an investigational product.
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Affiliation(s)
- Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Department of Pharmacy, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kazuhiro Ooe
- Institute for Radiation Sciences, Osaka University, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yoshifumi Shirakami
- Institute for Radiation Sciences, Osaka University, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kenta Kurimoto
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Department of Pharmacy, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Toshihiro Sakai
- Hanwa Intelligent Medical Center, Hanwa Daini Senboku Hospital, 3176 Fukaikitamachi, Naka- ku, Sakai, Osaka, 599-8271, Japan
| | - Kazuhiro Takahashi
- Advanced Clinical Research Center, Fukushima Global Medical Science Center, Fukushima Medical University, 1 Hikarigaoka, Fukushima, Fukushima, 960-1295, Japan
| | - Atsushi Toyoshima
- Institute for Radiation Sciences, Osaka University, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yang Wang
- Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Hiromitsu Haba
- Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Institute for Radiation Sciences, Osaka University, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Noriyuki Tomiyama
- Institute for Radiation Sciences, Osaka University, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- Institute for Radiation Sciences, Osaka University, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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Watabe T, David IR, Kimura T, Hiroshima T, Tatsumi M, Naka S, Kamiya T, Fukui E, Kanou T, Ose N, Funaki S, Mori Y, Cardinale J, Kato H, Morii E, Shintani Y, Giesel FL. Epithelioid granuloma mimicking lung cancer showed intense uptake on [ 18F]FAPI-74 PET. Eur J Nucl Med Mol Imaging 2024; 51:930-931. [PMID: 37891330 PMCID: PMC10796733 DOI: 10.1007/s00259-023-06478-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 10/13/2023] [Indexed: 10/29/2023]
Affiliation(s)
- Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- Institute for Radiation Sciences, Osaka University, Toyonaka, Japan.
| | - Ivan Ray David
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Department of Nuclear Medicine, Jose R. Reyes Memorial Medical Center, Manila, Philippines
| | - Toru Kimura
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Takashi Hiroshima
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Mitsuaki Tatsumi
- Institute for Radiation Sciences, Osaka University, Toyonaka, Japan
- Department of Radiology, Osaka University Hospital, Suita, Japan
| | - Sadahiro Naka
- Department of Pharmacy, Osaka University Hospital, Suita, Japan
| | - Takashi Kamiya
- Department of Radiology, Osaka University Hospital, Suita, Japan
| | - Eriko Fukui
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Takashi Kanou
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Naoko Ose
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Soichiro Funaki
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yuriko Mori
- Department of Nuclear Medicine, University Hospital Duesseldorf, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Jens Cardinale
- Department of Nuclear Medicine, University Hospital Duesseldorf, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Institute for Radiation Sciences, Osaka University, Toyonaka, Japan
| | - Eiichi Morii
- Department of Pathology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yasushi Shintani
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Frederik L Giesel
- Institute for Radiation Sciences, Osaka University, Toyonaka, Japan
- Department of Nuclear Medicine, University Hospital Duesseldorf, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
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Watabe T, Kabayama K, Naka S, Yamamoto R, Kaneda K, Serada S, Ooe K, Toyoshima A, Wang Y, Haba H, Kurimoto K, Kobayashi T, Shimosegawa E, Tomiyama N, Fukase K, Naka T. Immuno-PET and Targeted α-Therapy Using Anti-Glypican-1 Antibody Labeled with 89Zr or 211At: A Theranostic Approach for Pancreatic Ductal Adenocarcinoma. J Nucl Med 2023; 64:1949-1955. [PMID: 37827841 PMCID: PMC10690121 DOI: 10.2967/jnumed.123.266313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 09/06/2023] [Indexed: 10/14/2023] Open
Abstract
Glypican-1 (GPC1) is overexpressed in several solid cancers and is associated with tumor progression, whereas its expression is low in normal tissues. This study aimed to evaluate the potential of an anti-GPC1 monoclonal antibody (GPC1 mAb) labeled with 89Zr or 211At as a theranostic target in pancreatic ductal adenocarcinoma. Methods: GPC1 mAb clone 01a033 was labeled with 89Zr or 211At with a deferoxamine or decaborane linker, respectively. The internalization ability of GPC1 mAb was evaluated by fluorescence conjugation using a confocal microscope. PANC-1 xenograft mice (n = 6) were intravenously administered [89Zr]GPC1 mAb (0.91 ± 0.10 MBq), and PET/CT scanning was performed for 7 d. Uptake specificity was confirmed through a comparative study using GPC1-positive (BxPC-3) and GPC1-negative (BxPC-3 GPC1-knockout) xenografts (each n = 3) and a blocking study. DNA double-strand breaks were evaluated using the γH2AX antibody. The antitumor effect was evaluated by administering [211At]GPC1 mAb (∼100 kBq) to PANC-1 xenograft mice (n = 10). Results: GPC1 mAb clone 01a033 showed increased internalization ratios over time. One day after administration, a high accumulation of [89Zr]GPC1 mAb was observed in the PANC-1 xenograft (SUVmax, 3.85 ± 0.10), which gradually decreased until day 7 (SUVmax, 2.16 ± 0.30). The uptake in the BxPC-3 xenograft was significantly higher than in the BxPC-3 GPC1-knockout xenograft (SUVmax, 4.66 ± 0.40 and 2.36 ± 0.36, respectively; P = 0.05). The uptake was significantly inhibited in the blocking group compared with the nonblocking group (percentage injected dose per gram, 7.3 ± 1.3 and 12.4 ± 3.0, respectively; P = 0.05). DNA double-strand breaks were observed by adding 150 kBq of [211At]GPC1 and were significantly suppressed by the internalization inhibitor (dynasore), suggesting a substantial contribution of the internalization ability to the antitumor effect. Tumor growth suppression was observed in PANC-1 mice after the administration of [211At]GPC1 mAb. Internalization inhibitors (prochlorperazine) significantly inhibited the therapeutic effect of [211At]GPC1 mAb, suggesting an essential role in targeted α-therapy. Conclusion: [89Zr]GPC1 mAb PET showed high tumoral uptake in the early phase after administration, and targeted α-therapy using [211At]GPC1 mAb showed tumor growth suppression. GPC1 is a promising target for future applications for the precise diagnosis of pancreatic ductal adenocarcinoma and GPC1-targeted theranostics.
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Affiliation(s)
- Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Suita, Japan;
- Institute for Radiation Sciences, Osaka University, Suita, Japan
| | - Kazuya Kabayama
- Institute for Radiation Sciences, Osaka University, Suita, Japan
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Japan
- Forefront Research Center, Graduate School of Science, Osaka University, Toyonaka, Japan
| | - Sadahiro Naka
- Department of Pharmacy, Osaka University Hospital, Suita, Japan
| | - Ryuku Yamamoto
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Japan
| | - Kazuko Kaneda
- Institute for Radiation Sciences, Osaka University, Suita, Japan
- Forefront Research Center, Graduate School of Science, Osaka University, Toyonaka, Japan
| | - Satoshi Serada
- Institute for Biomedical Sciences Molecular Pathophysiology, Iwate Medical University, Yahaba, Japan
| | - Kazuhiro Ooe
- Institute for Radiation Sciences, Osaka University, Suita, Japan
| | | | - Yang Wang
- Nishina Center for Accelerator-Based Science, RIKEN, Saitama, Japan
| | - Hiromitsu Haba
- Nishina Center for Accelerator-Based Science, RIKEN, Saitama, Japan
| | - Kenta Kurimoto
- Department of Pharmacy, Osaka University Hospital, Suita, Japan
| | - Takanori Kobayashi
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Noriyuki Tomiyama
- Institute for Radiation Sciences, Osaka University, Suita, Japan
- Department of Radiology, Graduate School of Medicine, Osaka University, Suita, Japan; and
| | - Koichi Fukase
- Institute for Radiation Sciences, Osaka University, Suita, Japan
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Japan
- Forefront Research Center, Graduate School of Science, Osaka University, Toyonaka, Japan
| | - Tetsuji Naka
- Institute for Biomedical Sciences Molecular Pathophysiology, Iwate Medical University, Yahaba, Japan
- Division of Allergy and Rheumatology, Department of Internal Medicine, School of Medicine, Iwate Medical University, Yahaba, Japan
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Watabe T, Ose N, Naka S, Fukui E, Kimura T, Kanou T, Funaki S, Sasaki H, Kamiya T, Kurimoto K, Isohashi K, Tatsumi M, Shimosegawa E, Kato H, Ohgaki R, Kanai Y, Shintani Y. Evaluation of LAT1 Expression in Patients With Lung Cancer and Mediastinal Tumors: 18F-FBPA PET Study With Immunohistological Comparison. Clin Nucl Med 2023; 48:853-860. [PMID: 37682600 DOI: 10.1097/rlu.0000000000004816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
PURPOSE OF THE REPORT L-type amino acid transporter-1 (LAT1) is a tumor-specific transporter expressed in various tumor types, with minimal expression in normal organs. We previously demonstrated 18F-fluoro-borono-phenylalanine (18F-FBPA) as a selective PET probe for LAT1 in a preclinical study. Herein, we evaluated LAT1 expression in preoperative patients with lung or mediastinal tumors using 18F-FBPA PET and immunofluorescence staining. PATIENTS AND METHODS The study population included patients with histopathological diagnosis (n = 55): primary lung cancers (n = 21), lung metastases (n = 6), mediastinal tumors (n = 15), and benign lesion (n = 13). PET scanning was performed 1 hour after the injection of 18F-FBPA (232 ± 32 MBq). Immunofluorescence staining was performed on the resected tumor sections using LAT1 antibody. LAT1 staining was graded on a 4-grade scale and compared with the SUVmax on 18F-FBPA PET. RESULTS A positive correlation was observed between the SUVmax of 18F-FBPA PET and LAT1 expression by immunofluorescence staining (r = 0.611, P < 0.001). The SUVmax of 18F-FBPA was 3.92 ± 1.46 in grade 3, 3.21 ± 1.82 in grade 2, 2.33 ± 0.93 in grade 1, and 1.50 ± 0.39 in grade 0 of LAT1 expression. Although 18F-FBPA PET showed variable uptake in lung cancers and mediastinal tumors, benign lesions showed significantly lower SUVmax than those in malignant lesions (P < 0.01). CONCLUSIONS Uptake on 18F-FBPA PET reflected the expression level of LAT1 in lung and mediastinal tumors. It was suggested that 18F-FBPA PET can be used for the precise characterization of the tumor in pretreatment evaluation.
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Affiliation(s)
| | - Naoko Ose
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University
| | | | - Eriko Fukui
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University
| | - Toru Kimura
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University
| | - Takashi Kanou
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University
| | - Soichiro Funaki
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University
| | | | | | | | | | | | | | | | - Ryuichi Ohgaki
- Bio-system Pharmacology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Yoshikatsu Kanai
- Bio-system Pharmacology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Yasushi Shintani
- Department of General Thoracic Surgery, Graduate School of Medicine, Osaka University
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Watabe T, Fukusumi T, Inohara H, Tatsumi M, Naka S, Kamiya T, Kato H, Mori Y, Cardinale J, Giesel FL. Activated fibroblasts in muscle sarcoidosis revealed by [ 18F]FAPI-74 PET. Eur J Nucl Med Mol Imaging 2023; 50:3481-3482. [PMID: 37272954 PMCID: PMC10541834 DOI: 10.1007/s00259-023-06263-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/09/2023] [Indexed: 06/06/2023]
Affiliation(s)
- Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- Institute for Radiation Sciences, Osaka University, Osaka, Japan.
| | - Takahito Fukusumi
- Department of Otorhinolaryngology-Head and Neck Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Hidenori Inohara
- Department of Otorhinolaryngology-Head and Neck Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Sadahiro Naka
- Department of Pharmacy, Osaka University Hospital, Osaka, Japan
| | - Takashi Kamiya
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
| | - Yuriko Mori
- Department of Nuclear Medicine, Medical Faculty, University Hospital Duesseldorf, Heinrich-Heine-University, Dusseldorf, Germany
| | - Jens Cardinale
- Department of Nuclear Medicine, Medical Faculty, University Hospital Duesseldorf, Heinrich-Heine-University, Dusseldorf, Germany
| | - Frederik L Giesel
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
- Department of Nuclear Medicine, Medical Faculty, University Hospital Duesseldorf, Heinrich-Heine-University, Dusseldorf, Germany
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Watabe T, Naka S, Tatsumi M, Kamiya T, Kimura T, Shintani Y, Abe K, Miyake T, Shimazu K, Kobayashi S, Kurokawa Y, Eguchi H, Doki Y, Inohara H, Kato H, Mori Y, Cardinale J, Giesel FL. Initial Evaluation of [ 18F]FAPI-74 PET for Various Histopathologically Confirmed Cancers and Benign Lesions. J Nucl Med 2023:jnumed.123.265486. [PMID: 37268427 PMCID: PMC10394310 DOI: 10.2967/jnumed.123.265486] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/14/2023] [Indexed: 06/04/2023] Open
Abstract
The 18F-labeled fibroblast activation protein inhibitor (FAPI) [18F]FAPI-74 has the benefit of a higher synthetic yield and better image resolution than 68Ga-labeled FAPI. We preliminarily evaluated the diagnostic performance of [18F]FAPI-74 PET in patients with various histopathologically confirmed cancers or suspected malignancies. Methods: We enrolled 31 patients (17 men and 14 women) with lung cancer (n = 7), breast cancer (n = 5), gastric cancer (n = 5), pancreatic cancer (n = 3), other cancers (n = 5), and benign tumors (n = 6). Twenty-seven of the 31 patients were treatment-naïve or preoperative, whereas recurrence was suspected in the remaining 4 patients. Histopathologic confirmation was obtained for the primary lesions of 29 of the 31 patients. In the remaining 2 patients, the final diagnosis was based on the clinical course. [18F]FAPI-74 PET scanning was performed 60 min after the intravenous injection of [18F]FAPI-74 (240 ± 31 MBq). The [18F]FAPI-74 PET images were compared between the primary or local recurrent lesions of malignant tumors (n = 21) and nonmalignant lesions (n = 8: type-B1 thymomas, granuloma, solitary fibrous tumor, and postoperative or posttherapeutic changes). The uptake and number of detected lesions on [18F]FAPI-74 PET were also compared with those on [18F]FDG PET for available patients (n = 19). Results: [18F]FAPI-74 PET showed higher uptake in primary lesions of various cancers than in nonmalignant lesions (median SUVmax, 9.39 [range, 1.83-25.28] vs. 3.49 [range, 2.21-15.58]; P = 0.053), but some of the nonmalignant lesions showed high uptake. [18F]FAPI-74 PET also showed significantly higher uptake than [18F]FDG PET (median SUVmax, 9.44 [range, 2.50-25.28] vs. 5.45 [range, 1.22-15.06] in primary lesions [P = 0.010], 8.86 [range, 3.51-23.33] vs. 3.84 [range, 1.01-9.75] in lymph node metastases [P = 0.002], and 6.39 [range, 0.55-12.78] vs. 1.88 [range, 0.73-8.35] in other metastases [P = 0.046], respectively). In 6 patients, [18F]FAPI-74 PET detected more metastatic lesions than [18F]FDG PET. Conclusion: [18F]FAPI-74 PET showed higher uptake and detection rates in primary and metastatic lesions than did [18F]FDG PET. [18F]FAPI-74 PET is a promising novel diagnostic modality for various tumors, especially for precise staging before treatment, including characterization of tumor lesions before surgery. Moreover, 18F-labeled FAPI ligand might serve a higher demand in clinical care in the future.
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Affiliation(s)
- Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Osaka, Japan;
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
| | - Sadahiro Naka
- Department of Pharmacy, Osaka University Hospital, Osaka, Japan
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Takashi Kamiya
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Toru Kimura
- Department of Thoracic Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Yasushi Shintani
- Department of Thoracic Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Kaori Abe
- Department of Breast and Endocrine Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan;
| | - Tomohiro Miyake
- Department of Breast and Endocrine Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Kenzo Shimazu
- Department of Breast and Endocrine Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Shogo Kobayashi
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Yukinori Kurokawa
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Hidetoshi Eguchi
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Yuichiro Doki
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Hidenori Inohara
- Department of Otorhinolaryngology-Head and Neck Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan; and
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Osaka, Japan
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
| | - Yuriko Mori
- Department of Nuclear Medicine, University Hospital Duesseldorf, Heinrich Heine University, Duesseldorf, Germany
| | - Jens Cardinale
- Department of Nuclear Medicine, University Hospital Duesseldorf, Heinrich Heine University, Duesseldorf, Germany
| | - Frederik L Giesel
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
- Department of Nuclear Medicine, University Hospital Duesseldorf, Heinrich Heine University, Duesseldorf, Germany
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7
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Tatsumi M, Soeda F, Naka S, Kurimoto K, Ooe K, Fukui H, Katayama D, Watabe T, Kato H, Tomiyama N. Advantages of FBPA PET in evaluating early response of anti-PD-1 immunotherapy in B16F10 melanoma-bearing mice: Comparison to FDG PET. Front Oncol 2022; 12:1026608. [PMID: 36620558 PMCID: PMC9815495 DOI: 10.3389/fonc.2022.1026608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 12/07/2022] [Indexed: 12/24/2022] Open
Abstract
Purpose PET with L-4-borono-2-[18F] fluoro-phenylalanine (FBPA) was reported to be useful to differentiate malignant tumors and inflammation. Although immunotherapy with immune checkpoint inhibitors (ICIs) has been applied to cancer treatment recently, FDG PET may not be suitable to determine the effect of ICIs because of false-positive findings caused by treatment-related inflammation. In this study, we aimed to demonstrate that FBPA PET allowed detection of the early response of anti-PD-1 immunotherapy in tumor-bearing mice, comparing the results with those of FDG PET. Materials and methods Mice with B16F10 melanoma tumor xenografts were prepared. Anti-mouse PD-1 antibody or PBS was administered twice intraperitoneally to the tumor-bearing mice on Day 0 (3 days after inoculation) and Day 5 (treatment or control group ). PET/CT imaging was performed twice for each mouse on Day 0 before the anti-PD-1 antibody/PBS administration and on Day 7 using a micro-PET/CT scanner. FBPA and FDG PET/CT studies were conducted separately. SUVmax and the tumor to liver ratio (T/L ratio) were used as parameters exhibiting tumor activity. Tumor uptake volume (TUV) and metabolic tumor volume (MTV) were also calculated for FBPA and FDG, respectively. Changes between pre- and posttreatment SUVmax or T/L ratio were observed using the formula as follows: [(posttreatment parameter values/pretreatment values - 1) × 100] (%). Results Tumors in TrG were smaller than those in CoG on Day 7. SUVmax and T/L ratio represented no differences between TrG and CoG in FBPA and FDG PET before treatment. FBPA PET on Day 7 demonstrated that SUVmax, T/L ratio, and TUV in TrG were statistically smaller than those in CoG. %T/L ratio and %SUVmax exhibited the same trend in FBPA PET. However, FDG PET on Day 7 revealed no differences in all parameters between TrG and CoG. T/L ratio and %SUVmax in TrG represented larger values than those in CoG without statistical significances. Conclusion This study demonstrated that FBPA PET allowed detection of the early response of anti-PD-1 immunotherapy in B16F10 melanoma-bearing mice. FDG PET did not detect the response. Further studies are required to determine whether FBPA PET is useful in evaluating the treatment effect of ICIs in humans.
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Affiliation(s)
- Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, Suita, Osaka, Japan
| | - Fumihiko Soeda
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Kenta Kurimoto
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Kazuhiro Ooe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hideyuki Fukui
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Daisuke Katayama
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Noriyuki Tomiyama
- Department of Radiology, Osaka University Hospital, Suita, Osaka, Japan
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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Naka S, Watanabe T, Kanai Y, Watabe T, Tatsumi M, Kato H, Shimosegawa E, Hatazawa J. Improved Stability and Practicality for Synthesis of 4-Borono-2-[18F]fluoro-l-phenylalanine by Combination of [18O]O2 Single-Use and [18F]CH3COOF Labeling Agents. Nucl Med Mol Imaging 2022; 56:86-95. [PMID: 35449598 PMCID: PMC8976863 DOI: 10.1007/s13139-021-00719-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/20/2021] [Accepted: 10/06/2021] [Indexed: 11/30/2022] Open
Abstract
Purpose 4-Borono-2-[18F]fluoro-l-phenylalanine ([18F]FBPA) synthesized with [18F]F2, produced using the 18O(p, n)18F reaction, has been reported for increasing radioactivity. However, a dedicated system and complex procedure is required to reuse the costly [18O]O2 gas; also, the use of [18F]F2 as a labeling agent reduces the labeling rate and radiochemical purity. We developed a stable and practical method for [18F]FBPA synthesis by combining [18F]F2, produced using a [18O]O2 single-use system, and a [18F]CH3COOF labeling agent. Methods The produced [18F]F2 was optimized, and then [18F]FBPA was synthesized. For passivation of the target box, 0.5% F2 was pre-irradiated in argon. Gaseous products were discarded; the target box was filled with [18O]O2 gas, and then irradiated (first irradiation). Then, the [18O]O2 gas was discarded, 0.05–0.08% F2 in argon was fed into the target box, and it was again irradiated (second irradiation). The [18F]F2 obtained after this was passed through a CH3COONa column, converting it into the [18F]CH3COOF labeling agent, which was then used for [18F]FBPA synthesis. Results The mean amount of as-obtained [18F]F2 was 55.0 ± 3.3 GBq and that of as-obtained [18F]CH3COOF was 21.6 ± 1.4 GBq after the bombardment. The radioactivity and the radiochemical yield based on [18F]F2 of [18F]FBPA were 4.72 ± 0.34 GBq and 12.2 ± 0.1%, respectively. The radiochemical purity and molar activity were 99.3 ± 0.1% and 231 ± 22 GBq/mmol, respectively. Conclusion We developed a method for [18F]FBPA production, which is more stable and practical compared with the method using [18O]O2 gas-recycling and [18F]F2 labeling agent.
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Affiliation(s)
- Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871 Japan
- Department of Radiology, Osaka University Hospital, 2-15, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Toshimitsu Watanabe
- Radiochemistry and Targetry Section, Engineering Department, Medical & Advanced Equipment Unit, Industrial Equipment Division, Sumitomo Heavy Industries, 5-2, Soubiraki-cho, Niihama, Ehime 792-8588 Japan
| | - Yasukazu Kanai
- Department of Biofunctional Analysis, Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, 4-20-1, Nasahara, Takatsuki, Osaka 569-1094 Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, 2-15, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871 Japan
- Department of Quantum Cancer Therapy, Research Center for Nuclear Physics, Osaka University, 10-1, Mihogaoka, Osaka, Ibaraki 567-0047 Japan
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9
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Nguyen N, Yamada A, Naka S, Tani T. Zero-ischemic and sutureless partial nephrectomy by using microwave surgical device: Initial results in canine models. EUR UROL SUPPL 2021. [DOI: 10.1016/s2666-1683(21)01220-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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10
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Naka S, Watabe T, Lindner T, Cardinale J, Kurimoto K, Moore M, Tatsumi M, Mori Y, Shimosegawa E, Valla F, Kato H, Giesel FL. One-pot and one-step automated radio-synthesis of [ 18F]AlF-FAPI-74 using a multi purpose synthesizer: a proof-of-concept experiment. EJNMMI Radiopharm Chem 2021; 6:28. [PMID: 34420105 PMCID: PMC8380200 DOI: 10.1186/s41181-021-00142-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 07/23/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Fibroblast activation protein (FAP) is overexpressed in the stroma of many types of cancer. [18F]AlF-FAPI-74 is a positron emission tomography tracer with high selectivity for FAP, which has already shown high accumulation within human tumors in clinical studies. However, [18F]AlF-FAPI-74 radiosynthesis has not been optimized using an automated synthesizer. Herein, we report a one-pot and one-step automated radiosynthesis method using a multi purpose synthesizer. RESULTS Radiosynthesis of [18F]AlF-FAPI-74 was performed using a cassette-type multi purpose synthesizer CFN-MPS200. After the recovery rate of trapped [18F]fluoride onto the anion-exchange cartridge using a small amount of eluent was investigated manually, a dedicated [18F]AlF-FAPI-74 synthesis cassette and synthesis program for one-pot and one-step fluorination was developed. The solutions for the formulation of [18F]AlF-FAPI-74 synthesized using this were evaluated to obtain stable radiochemical purity. The recovery rate of [18F]fluoride with only 300 µL of eluent ranged 90 ± 9% by introduction from the male side and elution from the female side of the cartridge. In automated synthesis, the eluted [18F]fluoride and precursor solution containing aluminum chloride were mixed; then, fluorination was performed in a one-pot and one-step process at room temperature for 5 min, followed by 15 min at 95 °C. As a result, the radioactivity of [18F]AlF-FAPI-74 was 11.3 ± 1.1 GBq at the end of synthesis from 32 to 40 GBq of [18F]fluoride, and its radiochemical yield was 37 ± 4% (n = 10). The radiochemical purity at the end of the synthesis was ≥ 97% for all formulation solutions. When the diluent was saline, the radiochemical purity markedly decreased after 4 h of synthesis. In contrast, with phosphate-buffered saline (pH 7.4) or 10 mM phosphate-buffered saline (pH 6.7) containing 100 mg of sodium ascorbate, the radiochemical purity was stable at 97%. Non-radioactive AlF-FAPI-74 and total impurities, including non-radioactive AlF-FAPI-74, were 0.3 ± 0.1 µg/mL and 2.8 ± 0.6 µg/mL. Ethanol concentration and residual DMSO were 5.5 ± 0.2% and 21 ± 6 ppm, respectively. CONCLUSIONS We established a one-pot one-step automated synthesis method using a CFN-MPS200 synthesizer that provided high radioactivity and stable radiochemical purity for possible clinical applications.
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Affiliation(s)
- Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. .,Department of Radiology, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Thomas Lindner
- Department for Nuclear Medicine, University Hospital Heidelberg, INF 400, 69120, Heidelberg, Germany
| | - Jens Cardinale
- Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Kenta Kurimoto
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Melissa Moore
- SOFIE, 21000 Atlantic Boulevard Suite 730, Dulles, VA, 20166, USA
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yuriko Mori
- Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Frank Valla
- Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Frederik L Giesel
- Department for Nuclear Medicine, University Hospital Heidelberg, INF 400, 69120, Heidelberg, Germany.,Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany.,Institute for Radiation Sciences, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
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11
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Watabe T, Uemura M, Soeda F, Naka S, Ujike T, Hatano K, Sasaki H, Kamiya T, Shimosegawa E, Kato H, Cardinale J, Tateishi U, Nonomura N, Giesel FL. High detection rate in [ 18F]PSMA-1007 PET: interim results focusing on biochemical recurrence in prostate cancer patients. Ann Nucl Med 2021; 35:523-528. [PMID: 33661475 PMCID: PMC7981319 DOI: 10.1007/s12149-021-01602-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Accepted: 02/17/2021] [Indexed: 01/28/2023]
Abstract
Objective 18F-labeled prostate-specific membrane antigen (PSMA) ligand, [18F]PSMA-1007, has the benefit of a higher synthetic yield and minimal excretion in the urine. High detection efficacy was reported in biochemical recurrence (BCR) of prostate cancer after radical prostatectomy. Thus, we evaluated the preliminary diagnostic utility of [18F]PSMA-1007 PET in patients with prostate cancer, focusing on the BCR which is not detected on conventional imaging. Methods We enrolled a total of 28 patients (age 51–79 years) with BCR of prostate cancer. BCR was defined as a continuous increase in PSA after radical prostatectomy or radiation therapy without any apparent recurrent lesions on conventional diagnostic imaging (CT and bone scintigraphy). PSMA-PET scanning was performed approximately 60 min after intravenous injection of [18F]PSMA-1007 (259 ± 37 MBq). PSMA-PET images were evaluated for lesion detection as well as its relation to PSA values and location. Results Abnormal uptake, which was suspected to be recurrence or metastasis, was detected in 92.9% (26/28) of patients with BCR. The SUVmax was 8.4 ± 6.4 in local recurrence, 11.5 ± 11.8 in pelvic lymph nodes (LN), and 4.1 ± 1.6 in bone metastasis. The detection rates were 66.7% in the PSA group-1 (0.1–0.5 ng/mL), 85.7% in the PSA group-2 (0.5–1.0 ng/mL), and 100% in the PSA group-3 (above 1.0 ng/mL). Among the PET-positive BCR patients (n = 26), local recurrence was detected in 57.7% (15/26), pelvic LN in 42.3% (11/26), and bone metastasis in 15.4% (4/26). In 53% (8/15) of BCR patients who were suspected of local recurrence, focal uptake was detected adjacent to the bladder on [18F]PSMA-1007 PET. This suggested the significant advantage of having minimal physiological urine excretion. Conclusions [18F]PSMA-1007 PET showed a high detection rate in recurrent and metastatic lesions. In patients with BCR, its high detection led to suitable treatment strategies, such as salvage radiation therapy or surgical removal of recurrent lymph nodes. Trial registration (UMIN Clinical Trials Registry) UMIN000037697.
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Affiliation(s)
- Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- Institute for Radiation Sciences, Osaka University, Osaka, Japan.
| | - Motohide Uemura
- Department of Urology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Fumihiko Soeda
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Sadahiro Naka
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Takeshi Ujike
- Department of Urology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Koji Hatano
- Department of Urology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Hidetaka Sasaki
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Takashi Kamiya
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Eku Shimosegawa
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
- Department of Molecular Imaging in Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
| | - Jens Cardinale
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Ukihide Tateishi
- Department of Diagnostic Radiology, Medical Hospital, Tokyo Medical and Dental University, Tokyo, Japan
| | - Norio Nonomura
- Department of Urology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Frederik L Giesel
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
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12
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Sato T, Furuta T, Liu Y, Naka S, Nagamori S, Kanai Y, Watabe T. Individual dosimetry system for targeted alpha therapy based on PHITS coupled with microdosimetric kinetic model. EJNMMI Phys 2021; 8:4. [PMID: 33432383 PMCID: PMC7801536 DOI: 10.1186/s40658-020-00350-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Accepted: 12/21/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND An individual dosimetry system is essential for the evaluation of precise doses in nuclear medicine. The purpose of this study was to develop a system for calculating not only absorbed doses but also EQDX(α/β) from the PET-CT images of patients for targeted alpha therapy (TAT), considering the dose dependence of the relative biological effectiveness, the dose-rate effect, and the dose heterogeneity. METHODS A general-purpose Monte Carlo particle transport code PHITS was employed as the dose calculation engine in the system, while the microdosimetric kinetic model was used for converting the absorbed dose to EQDX(α/β). PHITS input files for describing the geometry and source distribution of a patient are automatically created from PET-CT images, using newly developed modules of the radiotherapy package based on PHITS (RT-PHITS). We examined the performance of the system by calculating several organ doses using the PET-CT images of four healthy volunteers after injecting 18F-NKO-035. RESULTS The deposition energy map obtained from our system seems to be a blurred image of the corresponding PET data because annihilation γ-rays deposit their energies rather far from the source location. The calculated organ doses agree with the corresponding data obtained from OLINDA 2.0 within 20%, indicating the reliability of our developed system. Test calculations by replacing the labeled radionuclide from 18F to 211At suggest that large dose heterogeneity in a target volume is expected in TAT, resulting in a significant decrease of EQDX(α/β) for higher-activity injection. CONCLUSIONS As an extension of RT-PHITS, an individual dosimetry system for nuclear medicine was developed based on PHITS coupled with the microdosimetric kinetic model. It enables us to predict the therapeutic and side effects of TAT based on the clinical data largely available from conventional external radiotherapy.
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Affiliation(s)
- Tatsuhiko Sato
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Shirakata 2-4, Tokai, Ibaraki, 319-1195, Japan.
- Research Center for Nuclear Physics, Osaka University, Suita, Japan.
| | - Takuya Furuta
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Shirakata 2-4, Tokai, Ibaraki, 319-1195, Japan
| | - Yuwei Liu
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Sadahiro Naka
- Department of Radiology, Osaka University Hospital, Suita, Japan
| | - Shushi Nagamori
- Department of Laboratory Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Yoshikatsu Kanai
- Department of Bio-system Pharmacology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Suita, Japan
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13
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Sprute K, Kramer V, Koerber SA, Meneses M, Fernandez R, Soza-Ried C, Eiber M, Weber WA, Rauscher I, Rahbar K, Schaefers M, Watabe T, Uemura M, Naka S, Nonomura N, Hatazawa J, Schwab C, Schütz V, Hohenfellner M, Holland-Letz T, Debus J, Kratochwil C, Amaral H, Choyke PL, Haberkorn U, Sandoval C, Giesel FL. Diagnostic Accuracy of 18F-PSMA-1007 PET/CT Imaging for Lymph Node Staging of Prostate Carcinoma in Primary and Biochemical Recurrence. J Nucl Med 2020; 62:208-213. [PMID: 32817141 PMCID: PMC8679593 DOI: 10.2967/jnumed.120.246363] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 06/04/2020] [Indexed: 12/12/2022] Open
Abstract
Prostate-specific membrane antigen (PSMA)-ligand PET/CT is performed on patients with prostate cancer to stage the disease initially or to identify sites of recurrence after definitive therapy. On the basis of clinical results, 18F-PSMA-1007 is a promising PSMA PET tracer, but detailed histologic confirmation has been lacking. Methods: Ninety-six patients with prostate cancer underwent 18F-PSMA-1007 PET/CT followed by either radical prostatectomy with lymphadenectomy or salvage lymphadenectomy. The histologic findings of PSMA PET-positive nodes were analyzed retrospectively. A lesion-based and patient-based analysis was performed comparing all positive lesions and only lesions larger than 3 mm on histopathology. Results: Of the patients, 90.6% received 18F-PSMA-1007 PET/CT for staging before the primary treatment, whereas 9.4% underwent imaging for biochemical recurrence. In 34.4% of the cohort, positive lymph nodes were present on imaging. In total, 1,746 lymph nodes were dissected in 96 patients. 18F-PSMA-1007 PET had a lesion-based sensitivity of 81.7%, a specificity of 99.6%, a positive predictive value of 92.4%, and a negative predictive value of 98.9% for detecting positive lymph nodes larger than 3 mm. In the analysis of all malignant nodes regardless of size, the overall sensitivity, specificity, positive predictive value, and negative predictive value on lesion-based analysis were 71.2%, 99.5%, 91.3%, and 97.9%, respectively. The patient-based analysis showed a sensitivity of 85.9% and a specificity of 99.5% for lymph nodes larger than 3 mm. Conclusion: 18F-PSMA-1007 PET/CT reliably detects malignant lymph nodes and has an exceptional specificity of more than 99% for nodal metastases.
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Affiliation(s)
- Katharina Sprute
- Department of Nuclear Medicine, University Hospital, Heidelberg, Germany
| | - Vasko Kramer
- Positronpharma SA, Santiago, Chile.,Center of Nuclear Medicine, PositronMed, Santiago, Chile
| | - Stefan A Koerber
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany.,National Center for Tumor Disease, Heidelberg, Germany.,Heidelberg Institute of Radiation Oncology, Heidelberg, Germany
| | | | - Rene Fernandez
- Center of Nuclear Medicine, PositronMed, Santiago, Chile
| | | | - Mathias Eiber
- Department of Nuclear Medicine, Munich University Hospital, Munich, Germany
| | - Wolfgang A Weber
- Department of Nuclear Medicine, Munich University Hospital, Munich, Germany
| | - Isabel Rauscher
- Department of Nuclear Medicine, Munich University Hospital, Munich, Germany
| | - Kambiz Rahbar
- Department of Nuclear Medicine, Muenster University Hospital, Muenster, Germany
| | - Michael Schaefers
- Department of Nuclear Medicine, Muenster University Hospital, Muenster, Germany
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Motohide Uemura
- Department of Urology, Osaka University Graduate School of Medicine, Osaka, Japan
| | | | - Norio Nonomura
- Department of Urology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Jun Hatazawa
- Research Center for Nuclear Physics, Osaka University, Osaka, Japan
| | - Constantin Schwab
- Department of Pathology, Heidelberg University Hospital, Heidelberg, Germany
| | - Viktoria Schütz
- Department of Urology, Heidelberg University Hospital, Heidelberg, Germany
| | | | - Tim Holland-Letz
- Department of Biostatistics, German Cancer Research Center, Heidelberg, Germany
| | - Juergen Debus
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany.,National Center for Tumor Disease, Heidelberg, Germany.,Heidelberg Institute of Radiation Oncology, Heidelberg, Germany.,Heidelberg Institute of Radiation Oncology, Heidelberg, Germany.,Department of Radiation Oncology, Heidelberg Ion-Beam Therapy Center, Heidelberg University Hospital, Heidelberg, Germany.,Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center, Heidelberg, Germany
| | - Clemens Kratochwil
- Department of Nuclear Medicine, University Hospital, Heidelberg, Germany.,Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany; and
| | - Horacio Amaral
- Positronpharma SA, Santiago, Chile.,Center of Nuclear Medicine, PositronMed, Santiago, Chile
| | - Pete L Choyke
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Uwe Haberkorn
- Department of Nuclear Medicine, University Hospital, Heidelberg, Germany.,Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany; and
| | | | - Frederik L Giesel
- Department of Nuclear Medicine, University Hospital, Heidelberg, Germany .,Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,German Cancer Consortium, Heidelberg, Germany.,Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany; and
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14
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Naka S, Watabe T, Kurimoto K, Uemura M, Soeda F, Neels OC, Kopka K, Tatsumi M, Kato H, Nonomura N, Shimosegawa E, Cardinale J, Giesel FL, Hatazawa J. Automated [ 18F]PSMA-1007 production by a single use cassette-type synthesizer for clinical examination. EJNMMI Radiopharm Chem 2020; 5:18. [PMID: 32728815 PMCID: PMC7391460 DOI: 10.1186/s41181-020-00101-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/13/2020] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND [18F]PSMA-1007, a positron emission tomography (PET) tracer, specifically targets prostate-specific membrane antigen (PSMA), which is highly expressed in prostate cancer. PSMA-PET is effective especially for regional detection of biochemical recurrence, which significantly affects patient management. Herein, we established and optimized a one-step radiolabeling protocol to separate and purify [18F]PSMA-1007 with a CFN-MPS200 synthesizer for clinical application. RESULTS A dedicated single use cassette and synthesis program for [18F]PSMA-1007 was generated using a single-step method for direct precursor radiolabeling. In the cassette, three tube types (fluoro-elastomer, PharMed® BPT, silicone) and two different precursor salts (trifluoroacetic acid or acetic acid) were compared for optimization. Furthermore, three-lot tests were performed under optimized conditions for quality confirmation. Activity yields and mean radiochemical purity of [18F]PSMA-1007 were > 5000 MBq and 95%, respectively, at the end of synthesis, and the decay-corrected mean radiochemical yield from all three cassettes was approximately 40% using a trifluoroacetic acid salt precursor. Fluoro-elastomer tubings significantly increased the amount of non-radioactive PSMA-1007 (8.5 ± 3.1 μg/mL) compared to those with other tubings (0.3 μg/mL). This reduced the molar activity of [18F]PSMA-1007 synthesized in the cassette assembled by fluoro-elastomer tubings (46 GBq/μmol) compared to that with PharMed® BPT and silicone tubings (1184 and 1411 GBq/μmol, respectively). Residual tetrabutylammonium, acetonitrile, and dimethyl sulfoxide levels were < 2.6 μg/mL, < 8 ppm, and < 11 ppm, respectively, and ethanol content was 8.0-8.1% in all three cassettes and two different salts. Higher activity yields, radiochemical purities, and decay-corrected radiochemical yields were obtained using an acetic acid salt precursor rather than a trifluoroacetic acid salt precursor (7906 ± 1216 MBq, 97% ± 0%, and 56% ± 4%). In the three-lot tests under conditions optimized with silicone cassettes and acetic acid salt precursor, all quality items passed the specifications required for human use. CONCLUSIONS We successfully automated the production of [18F]PSMA-1007 for clinical use and optimized synthesis procedures with a CFN-MPS200 synthesizer using a silicone cassette and acetic acid salt precursor. Cassette availability will facilitate a wide spread use of [18F]PSMA-1007-PET, leading to an effective prostate cancer management.
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Affiliation(s)
- Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. .,Department of Radiology, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kenta Kurimoto
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Motohide Uemura
- Department of Urology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Fumihiko Soeda
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Oliver C Neels
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Klaus Kopka
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Norio Nonomura
- Department of Urology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Jens Cardinale
- Department for Nuclear Medicine, University Hospital Heidelberg, INF 400, 69120, Heidelberg, Germany
| | - Frederik L Giesel
- Department for Nuclear Medicine, University Hospital Heidelberg, INF 400, 69120, Heidelberg, Germany
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Department of Quantum Cancer Therapy, Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Osaka, Ibaraki, 567-0047, Japan
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15
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Soeda F, Watabe T, Naka S, Liu Y, Horitsugi G, Neels OC, Kopka K, Tatsumi M, Shimosegawa E, Giesel FL, Hatazawa J. Impact of 18F-PSMA-1007 Uptake in Prostate Cancer Using Different Peptide Concentrations: Preclinical PET/CT Study on Mice. J Nucl Med 2019; 60:1594-1599. [PMID: 30902876 DOI: 10.2967/jnumed.118.223479] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 03/13/2019] [Indexed: 11/16/2022] Open
Abstract
PET radioligands with low molar activity (MA) may underestimate the quantity of the target of interest because of competitive binding of the target with unlabeled ligand. The aim of this study was to evaluate the change in the whole-body distribution of 18F-PSMA-1007 targeting prostate-specific membrane antigen (PSMA) when solutions with different peptide concentrations are used. Methods: Mouse xenograft models of LNCaP (PSMA-positive prostate cancer) (n = 18) were prepared and divided into 3 groups according to the peptide concentration injected: a high-MA group (1,013 ± 146 GBq/μmol; n = 6), a medium-MA group (100.7 ± 23.1 GBq/μmol; n = 6), and a low-MA group (10.80 ± 2.84 GBq/μmol; n = 6). Static PET scans were performed 1 h after injection (scan duration, 10 min). SUVmean in tumor and normal organs was compared by the multiple-comparison test. Immunohistochemical staining and Western blot analysis were performed to confirm expression of PSMA in tumor, salivary gland, and kidney. Results: The low-MA group (SUVmean, 1.12 ± 0.30) showed significantly lower uptake of 18F-PSMA-1007 in tumor than did the high-MA group (1.97 ± 0.77) and the medium-MA group (1.81 ± 0.57). On the other hand, in salivary gland, both the low-MA group (SUVmean, 0.24 ± 0.04) and the medium-MA group (0.57 ± 0.08) showed significantly lower uptake than the high MA group (1.27 ± 0.28). The tumor-to-salivary gland SUVmean ratio was 1.73 ± 0.55 in the high-MA group, 3.16 ± 0.86 in the medium-MA group, and 4.78 ± 1.29 in the low-MA group. The immunohistochemical staining and Western blot analysis revealed significant overexpression of PSMA in tumor and low expression in salivary gland and kidney. Conclusion: A decrease in the MA level of the injected 18F-PSMA-1007 solution resulted in decreased uptake in tumor and, to a greater degree, in normal salivary gland. Thus, there is a possibility of minimizing the adverse effects in salivary gland by setting an appropriate MA level in PSMA-targeting therapy.
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Affiliation(s)
- Fumihiko Soeda
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Sadahiro Naka
- Department of Pharmaceuticals, Osaka University Hospital, Osaka, Japan
| | - Yuwei Liu
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Oliver C Neels
- Division of Radiopharmaceutical Chemistry, German Cancer Research Center, Heidelberg, Germany
| | - Klaus Kopka
- Division of Radiopharmaceutical Chemistry, German Cancer Research Center, Heidelberg, Germany.,German Cancer Consortium, Heidelberg, Germany
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, Osaka, Japan
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Osaka, Japan; and
| | - Frederik L Giesel
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany.,German Cancer Consortium, Heidelberg, Germany
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
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16
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Beshr R, Isohashi K, Watabe T, Naka S, Horitsugi G, Romanov V, Kato H, Miyatake SI, Shimosegawa E, Hatazawa J. Preliminary feasibility study on differential diagnosis between radiation-induced cerebral necrosis and recurrent brain tumor by means of [ 18F]fluoro-borono-phenylalanine PET/CT. Ann Nucl Med 2018; 32:702-708. [PMID: 30194665 DOI: 10.1007/s12149-018-1296-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 08/30/2018] [Indexed: 12/15/2022]
Abstract
OBJECTIVES A previous study reported that a differential diagnosis between glioblastoma progression and radiation necrosis by 4-borono-2-[18F]-fluoro-phenylalanine ([18F]FBPA) PET can be made based on lesion-to-normal ratio of [18F]FBPA accumulation. Two-dimensional data acquisition mode PET alone system, with in-plane resolution of 7.9 mm and axial resolution of 13.9 mm, was used. In the current study, we aimed to confirm the differential diagnostic capability of [18F]FBPA PET/CT with higher PET spatial resolution by three-dimensional visual inspection and by measuring mean standardized uptake value (SUVmean), maximum SUV (SUVmax), metabolic tumor volume (MTV), and total lesion (TL) [18F]FBPA uptake. METHODS Twelve patients of glioma (9), malignant meningioma (1), hemangiopericytoma (1), and metastatic brain tumor (1) were enrolled. All had preceding radiotherapy. High-resolution three-dimensional data acquisition mode PET/CT with in-plane resolution of 4.07 mm and axial resolution of 5.41 mm was employed for imaging. Images were three-dimensionally analyzed using the PMOD software. SUVmean and SUVmax of lesion and normal brain were measured. Lesion MTV and TL FBPA uptake were calculated. The diagnostic accuracy of [18F]FBPA PET/CT in detecting recurrence (n = 6) or necrosis (n = 6) was verified by clinical follow-up. RESULTS All parameters showed significantly higher values for tumor recurrence than for necrosis. SUVmean in recurrence was 2.95 ± 0.84 vs 1.18 ± 0.24 in necrosis (P = 0.014); SUVmax in recurrence was 4.63 ± 1.23 vs 1.93 ± 0.44 in necrosis (P = 0.014); MTV in recurrence was 44.92 ± 28.93 mL vs 10.66 ± 8.46 mL in necrosis (P = 0.032); and mean TL FBPA uptake in recurrence was 121.01 ± 50.48 g vs 12.36 ± 9.70 g in necrosis (P = 0.0029). CONCLUSION In this preliminary feasibility study, we confirmed the possibility of differentiating tumor recurrence from radiation necrosis in patients with irradiated brain tumors by [18F]FBPA PET/CT using indices of SUVmean, SUVmax, MTV, and TL 18FBPA uptake.
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Affiliation(s)
- Rouaa Beshr
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan.,Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan
| | - Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Victor Romanov
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan.,Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Shin-Ichi Miyatake
- Department of Neurosurgery, Osaka Medical College, Takatsuki, Osaka, Japan
| | - Eku Shimosegawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan. .,Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan.
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17
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Aoe J, Watabe T, Shimosegawa E, Kato H, Kanai Y, Naka S, Matsunaga K, Isohashi K, Tatsumi M, Hatazawa J. Evaluation of the default-mode network by quantitative 15O-PET: comparative study between cerebral blood flow and oxygen consumption. Ann Nucl Med 2018; 32:485-491. [PMID: 29934675 PMCID: PMC6061207 DOI: 10.1007/s12149-018-1272-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Accepted: 06/19/2018] [Indexed: 11/29/2022]
Abstract
Objective Resting-state functional MRI (rs-fMRI) has revealed the existence of a default-mode network (DMN) based on spontaneous oscillations of the blood oxygenation level-dependent (BOLD) signal. The BOLD signal reflects the deoxyhemoglobin concentration, which depends on the relationship between the regional cerebral blood flow (CBF) and the cerebral metabolic rate of oxygen (CMRO2). However, these two factors cannot be separated in BOLD rs-fMRI. In this study, we attempted to estimate the functional correlations in the DMN by means of quantitative 15O-labeled gases and water PET, and to compare the contribution of the CBF and CMRO2 to the DMN. Methods Nine healthy volunteers (5 men and 4 women; mean age, 47.0 ± 1.2 years) were studied by means of 15O-O2, 15O-CO gases and 15O-water PET. Quantitative CBF and CMRO2 images were generated by an autoradiographic method and transformed into MNI standardized brain template. Regions of interest were placed on normalized PET images according to the previous rs-fMRI study. For the functional correlation analysis, the intersubject Pearson’s correlation coefficients (r) were calculated for all pairs in the brain regions and correlation matrices were obtained for CBF and CMRO2, respectively. We defined r > 0.7 as a significant positive correlation and compared the correlation matrices of CBF and CMRO2. Results Significant positive correlations (r > 0.7) were observed in 24 pairs of brain regions for the CBF and 22 pairs of brain regions for the CMRO2. Among them, 12 overlapping networks were observed between CBF and CMRO2. Correlation analysis of CBF led to the detection of more brain networks as compared to that of CMRO2, indicating that the CBF can capture the state of the spontaneous activity with a higher sensitivity. Conclusions We estimated the functional correlations in the DMN by means of quantitative PET using 15O-labeled gases and water. The correlation matrix derived from the CBF revealed a larger number of brain networks as compared to that derived from the CMRO2, indicating that contribution to the functional correlation in the DMN is higher in the blood flow more than the oxygen consumption.
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Affiliation(s)
- Jo Aoe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Eku Shimosegawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yasukazu Kanai
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Sadahiro Naka
- Department of Pharmacology, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Keiko Matsunaga
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Hospital, 2-15 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
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18
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Komatsu Y, Nishijima KI, Oomagari S, Kanai Y, Naka S, Higashikawa K, Ebita Y, Shiga T, Hatazawa J, Tamaki N, Kuge Y. Measurement of Iodine-Derived Contamination in L-[ 11C]Methionine Injection. ACTA ACUST UNITED AC 2018. [DOI: 10.3769/radioisotopes.67.75] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Yukiko Komatsu
- Department of Nuclear Medicine, Graduate School of Medicine, Hokkaido University
| | - Ken-ichi Nishijima
- Central Institute of Isotope Science, Hokkaido University
- Department of Integrated Molecular Imaging, Graduate School of Medicine, Hokkaido University
| | | | - Yasukazu Kanai
- Department of Molecular Imaging in Medicine, Graduate School of Medicine, Osaka University
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University
| | - Kei Higashikawa
- Central Institute of Isotope Science, Hokkaido University
- Department of Integrated Molecular Imaging, Graduate School of Medicine, Hokkaido University
| | - Yoko Ebita
- Central Institute of Isotope Science, Hokkaido University
| | - Tohru Shiga
- Department of Nuclear Medicine, Graduate School of Medicine, Hokkaido University
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University
| | - Nagara Tamaki
- Department of Nuclear Medicine, Graduate School of Medicine, Hokkaido University
| | - Yuji Kuge
- Central Institute of Isotope Science, Hokkaido University
- Department of Integrated Molecular Imaging, Graduate School of Medicine, Hokkaido University
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19
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Horitsugi G, Watabe T, Kanai Y, Ikeda H, Kato H, Naka S, Ishibashi M, Matsunaga K, Isohashi K, Shimosegawa E, Hatazawa J. Oxygen-15 labeled CO 2, O 2, and CO PET in small animals: evaluation using a 3D-mode microPET scanner and impact of reconstruction algorithms. EJNMMI Res 2017; 7:91. [PMID: 29080056 PMCID: PMC5660010 DOI: 10.1186/s13550-017-0335-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 10/16/2017] [Indexed: 11/10/2022] Open
Abstract
Background Positron emission tomography (PET) studies using 15O-labeled CO2, O2, and CO have been used in humans to evaluate cerebral blood flow (CBF), the cerebral oxygen extraction fraction (OEF), and the cerebral metabolic rate of oxygen (CMRO2) and cerebral blood volume (CBV), respectively. In preclinical studies, however, PET studies using 15O-labeled gases are not widely performed because of the technical difficulties associated with handling labeled gases with a short half-life. The aims of the present study were to evaluate the scatter fraction using 3D-mode micro-PET for 15O-labeled gas studies and the influence of reconstruction algorithms on quantitative values. Nine male SD rats were studied using the steady state inhalation method for 15O-labeled gases with arterial blood sampling. The resulting PET images were reconstructed using filtered back projection (FBP), ordered-subset expectation maximization (OSEM) 2D, or OSEM 3D followed by maximum a posteriori (OSEM3D-MAP). The quantitative values for each brain region and each reconstruction method were calculated by applying different reconstruction methods. Results The quantitative values for the whole brain as calculated using FBP were 46.6 ± 12.5 mL/100 mL/min (CBF), 63.7 ± 7.2% (OEF), 5.72 ± 0.34 mL/100 mL/min (CMRO2), and 5.66 ± 0.34 mL/100 mL (CBV), respectively. The CBF and CMRO2 values were significantly higher when the OSEM2D and OSEM3D-MAP reconstruction methods were used, compared with FBP, whereas the OEF values were significantly lower when reconstructed using OSEM3D-MAP. Conclusions We evaluated the difference in quantitative values among the reconstruction algorithms using 3D-mode micro-PET. The iterative reconstruction method resulted in significantly higher quantitative values for CBF and CMRO2, compared with the values calculated using the FBP reconstruction method. Electronic supplementary material The online version of this article (10.1186/s13550-017-0335-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yasukazu Kanai
- Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hayato Ikeda
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Mana Ishibashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Keiko Matsunaga
- Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Eku Shimosegawa
- Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. .,Medical Imaging Center for Translational Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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20
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Mochida I, Shimosegawa E, Kanai Y, Naka S, Matsunaga K, Isohashi K, Horitsugi G, Watabe T, Kato H, Hatazawa J. Whole-Body Distribution of Donepezil as an Acetylcholinesterase Inhibitor after Oral Administration in Normal Human Subjects: A 11C-donepezil PET Study. Asia Ocean J Nucl Med Biol 2017; 5:3-9. [PMID: 28840133 PMCID: PMC5221682 DOI: 10.22038/aojnmb.2016.7513] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Objective(s): It is difficult to investigate the whole-body distribution of an orally administered drug by means of positron emission tomography (PET), owing to the short physical half-life of radionuclides, especially when 11C-labeled compounds are tested. Therefore, we aimed to examine the whole-body distribution of donepezil (DNP) as an acetylcholinesterase inhibitor by means of 11C-DNP PET imaging, combined with the oral administration of pharmacological doses of DNP. Methods: We studied 14 healthy volunteers, divided into group A (n=4) and group B (n=10). At first, we studied four females (mean age: 57.3±4.5 y), three of whom underwent 11C-DNP PET scan at 2.5 h after the oral administration of 1 mg and 30 µg of DNP, respectively, while one patient was scanned following the oral administration of 30 µg of DNP (group A). Then, we studied five females and five males (48.3±6.1 y), who underwent 11C-DNP PET scan, without the oral administration of DNP (group B). Plasma DNP concentration upon scanning was measured by tandem mass spectrometry. Arterialized venous blood samples were collected periodically to measure plasma radioactivity and metabolites. In group A, 11C-DNP PET scan of the brain and whole body continued for 60 and 20 min, respectively. Subjects in group B underwent sequential whole-body scan for 60 min. The regional uptake of 11C-DNP was analyzed by measuring the standard uptake value (SUV) through setting regions of interest on major organs with reference CT. Results: In group A, plasma DNP concentration was significantly correlated with the orally administered dose of DNP. The mean plasma concentration was 2.00 nM (n=3) after 1 mg oral administration and 0.06 nM (n=4) after 30 µg oral administration. No significant difference in plasma radioactivity or fraction of metabolites was found between groups A and B. High 11C-DNP accumulation was found in the liver, stomach, pancreas, brain, salivary glands, bone marrow, and myocardium in groups A and B, in this order. No significant difference in SUV value was found among 11C-DNP PET studies after the oral administration of 1 mg of DNP, 30 µg of DNP, or no DNP. Conclusion: The present study demonstrated that the whole-body distribution of DNP after the oral administration of pharmacological doses could be evaluated by 11C-DNP PET studies, combined with the oral administration of DNP.
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Affiliation(s)
- Ikuko Mochida
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,Osaka University Graduate School of Medicine, Immunology Frontier Research Center, Osaka, Japan
| | - Eku Shimosegawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yasukazu Kanai
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,Osaka University Hospital, Osaka, Japan
| | - Keiko Matsunaga
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan.,Osaka University Graduate School of Medicine, Immunology Frontier Research Center, Osaka, Japan
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21
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Isohashi K, Shimosegawa E, Naka S, Kanai Y, Horitsugi G, Mochida I, Matsunaga K, Watabe T, Kato H, Tatsumi M, Hatazawa J. Comparison of the image-derived radioactivity and blood-sample radioactivity for estimating the clinical indicators of the efficacy of boron neutron capture therapy (BNCT): 4-borono-2- 18F-fluoro-phenylalanine (FBPA) PET study. EJNMMI Res 2016; 6:75. [PMID: 27757932 PMCID: PMC5069228 DOI: 10.1186/s13550-016-0230-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 10/04/2016] [Indexed: 11/10/2022] Open
Abstract
Background In boron neutron capture therapy (BNCT), positron emission tomography (PET) with 4-borono-2-18F-fluoro-phenylalanine (FBPA) is the only method to estimate an accumulation of 10B to target tumor and surrounding normal tissue after administering 10B carrier of L-paraboronophenylalanine and to search the indication of BNCT for individual patient. Absolute concentration of 10B in tumor has been estimated by multiplying 10B concentration in blood during BNCT by tumor to blood radioactivity (T/B) ratio derived from FBPA PET. However, the method to measure blood radioactivity either by blood sampling or image data has not been standardized. We compared image-derived blood radioactivity of FBPA with blood sampling data and studied appropriate timing and location for measuring image-derived blood counts. Methods We obtained 7 repeated whole-body PET scans in five healthy subjects. Arterialized venous blood samples were obtained from the antecubital vein, heated in a heating blanket. Time-activity curves (TACs) of image-derived blood radioactivity were obtained using volumes of interest (VOIs) over ascending aorta, aortic arch, pulmonary artery, left and right ventricles, inferior vena cava, and abdominal aorta. Image-derived blood radioactivity was compared with those measured by blood sampling data in each location. Results Both the TACs of blood sampling radioactivity in each subject, and the TACs of image-derived blood radioactivity showed a peak within 5 min after the tracer injection, and promptly decreased soon thereafter. Linear relationship was found between blood sampling radioactivity and image-derived blood radioactivity in all the VOIs at any timing of data sampling (p < 0.001). Image-derived radioactivity measured in the left and right ventricles 30 min after injection showed high correlation with blood radioactivity. Image-derived blood radioactivity was lower than blood sampling radioactivity data by 20 %. Reduction of blood radioactivity of FBPA in left ventricle after 30 min of FBPA injection was minimal. Conclusion We conclude that the image-derived T/B ratio can be reliably used by setting the VOI on the left ventricle at 30 min after FBPA administration and correcting for underestimation due to partial volume effect and reduction of FBPA blood radioactivity.
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Affiliation(s)
- Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan.
| | - Eku Shimosegawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan
| | - Yasukazu Kanai
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan
| | - Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan
| | - Ikuko Mochida
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan
| | - Keiko Matsunaga
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan.,Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan
| | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka, 565-0871, Japan.,Department of Immunology Frontier Research Center, Osaka University, Suita City, Osaka, Japan
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Shimosegawa E, Isohashi K, Naka S, Horitsugi G, Hatazawa J. Assessment of 10B concentration in boron neutron capture therapy: potential of image-guided therapy using 18FBPA PET. Ann Nucl Med 2016; 30:749-755. [PMID: 27586407 DOI: 10.1007/s12149-016-1121-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 08/29/2016] [Indexed: 11/24/2022]
Abstract
OBJECTIVES In boron neutron capture therapy (BNCT) for cancer, the accurate estimation of 10B tissue concentrations, especially in neighboring normal organs, is important to avoid adverse effects. The 10B concentration in normal organs after loading with 10B, however, has not been established in humans. In this study, we performed 4-borono-2-[18F]-fluoro-phenylalanine (18FBPA) PET in healthy volunteers and estimated the chronological changes in the 10B concentrations of normal organs. METHODS In 6 healthy volunteers, whole-body 18FBPA PET scans were repeated 7 times during 1 h, and the mean 18FBPA distributions of 13 organs were measured. Based on the 18FBPA PET data, we then estimated the changes in the 10B concentrations of the organs when the injection of a therapeutic dose of 10BPA-fructose complex (10BPA-fr; 30 g, 500 mg/kg body weight) was assumed. RESULTS The maximum mean 18FBPA concentrations were reached at 2-6 min after injection in all the organs except the brain and urinary bladder. The mean 18FBPA concentration in normal brain plateaued at 24 min after injection. When the injection of a therapeutic dose of 10BPA-fr was assumed, the estimated mean 10B concentration in the kidney increased to 126.1 ± 24.2 ppm at 3 min after injection and then rapidly decreased to 30.9 ± 7.4 ppm at 53 min. The estimated mean 10B concentration in the bladder gradually increased and reached 383.6 ± 214.7 ppm at 51 min. The mean 10B concentration in the brain was estimated to be 7.6 ± 1.5 ppm at 57 min. CONCLUSIONS 18FBPA PET has a potential to estimate 10B concentration of normal organs before neutron irradiation of BNCT when several assumptions are validated in the future studies.
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Affiliation(s)
- Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Japan. .,Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan.
| | - Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan
| | | | | | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan
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Naka S, Nomura R, Takashima Y, Okawa R, Ooshima T, Nakano K. A specific Streptococcus mutans strain aggravates non-alcoholic fatty liver disease. Oral Dis 2016; 20:700-6. [PMID: 25360469 DOI: 10.1111/odi.12191] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Streptococcus mutans, a major dental caries pathogen, has shown to be associated with the aggravation of cerebral hemorrhage and inflammatory bowel diseases. In this study, we evaluated the effects ofS. mutans on the development of non-alcoholic steatohepatitis (NASH) in a mouse model. MATERIALS AND METHODS Streptococcus mutans oral strain MT8148 (serotype c) and a blood isolate TW871 (k) were used. C57BL/6J mice (6 weeks old)were fed a high-fat diet for 4 weeks; the test strains or phosphate-buffered saline was then intravenously administered. Mice were euthanized after 8 or 12 weeks. Whole body, extirpated liver, and visceral fat weights were determined, and histopathological evaluations of the liver specimens were performed. RESULTS Mice infected with TW871 showed significantly greater body and liver weights than those administered MT8148 or phosphate-buffered saline. Histopathological analyses revealed prominent infiltration of inflammatory cells and adipocellular deposition in livers extirpated 8 weeks after an infection with TW871; fibrosis was also observed in livers extirpated after 12 weeks. CONCLUSION These results suggest that a specific strain of S. mutans could induce NASH.
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Hanaoka K, Watabe T, Naka S, Kanai Y, Ikeda H, Horitsugi G, Kato H, Isohashi K, Shimosegawa E, Hatazawa J. FBPA PET in boron neutron capture therapy for cancer: prediction of (10)B concentration in the tumor and normal tissue in a rat xenograft model. EJNMMI Res 2014; 4:70. [PMID: 25621196 PMCID: PMC4293470 DOI: 10.1186/s13550-014-0070-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 11/27/2014] [Indexed: 11/10/2022] Open
Abstract
Background Boron neutron capture therapy (BNCT) is a molecular radiation treatment based on the 10B (n, α) 7Li nuclear reaction in cancer cells, in which delivery of 10B by 4-borono-phenylalanine conjugated with fructose (BPA-fr) to the cancer cells is of critical importance. The PET tracer 4-borono-2-18 F-fluoro-phenylalanine (FBPA) has been used to predict the accumulation of BPA-fr before BNCT. However, because of the difference in chemical structure between BPA-fr and FBPA and the difference in the dose administered between BPA-fr (therapeutic dose) and FBPA (tracer dose), the predictive value of FBPA PET for BPA-fr accumulation in the tumor and normal tissues is not yet clearly proven. We conducted this study to validate FBPA PET as a useful test to predict the accumulation of BPA-fr in the tumor and normal tissues before BNCT. Methods RGC-6 rat glioma cells (1.9 × 107) were implanted subcutaneously in seven male F344 rats. On day 20 after the tumor implantation, dynamic PET scan was performed on four rats after injection of FBPA for 1 h. Whole-body PET/CT was performed 1 h after intravenous injection of the FBPA solution (30.5 ± 0.7 MBq, 1.69 ± 1.21 mg/kg). PET accumulation of FBPA in the tumor tissue and various normal tissues was estimated as a percentage of the injected dose per gram (%ID/g). One hour after the PET/CT scan, BPA-fructose (167.32 ± 18.65 mg/kg) was injected intravenously, and the rats were dissected 1 h after the BPA-fr injection. The absolute concentration of 10B in the autopsied tissues and blood was measured by inductively coupled plasma optical emission spectrometry (ICP-OES). Results The highest absolute concentration of 10B determined by ICP-OES was found in the kidney (4.34 ± 0.84 %ID/g), followed by the pancreas (2.73 ± 0.63 %ID/g), and the tumor (1.44 ± 0.44 %ID/g). A significant positive correlation was found between the accumulation levels of BPA-fr and FBPA (r = 0.91, p < 0.05). Conclusions FBPA PET can reliably predict accumulation of BPA-fr in the tumor as well as normal tissues. Electronic supplementary material The online version of this article (doi:10.1186/s13550-014-0070-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kohei Hanaoka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan
| | - Tadashi Watabe
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Japan ; PET Molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Japan
| | | | - Yasukazu Kanai
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Japan ; PET Molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hayato Ikeda
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan
| | - Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan ; PET Molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Japan
| | - Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan ; PET Molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Japan
| | - Eku Shimosegawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan ; PET Molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Japan ; PET Molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Japan ; Immunology Frontier Research Center, Osaka University, Suita, Japan
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Watabe T, Naka S, Ikeda H, Horitsugi G, Kanai Y, Isohashi K, Ishibashi M, Kato H, Shimosegawa E, Watabe H, Hatazawa J. Distribution of intravenously administered acetylcholinesterase inhibitor and acetylcholinesterase activity in the adrenal gland: 11C-donepezil PET study in the normal rat. PLoS One 2014; 9:e107427. [PMID: 25225806 PMCID: PMC4166663 DOI: 10.1371/journal.pone.0107427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 08/10/2014] [Indexed: 12/30/2022] Open
Abstract
Purpose Acetylcholinesterase (AChE) inhibitors have been used for patients with Alzheimer's disease. However, its pharmacokinetics in non-target organs other than the brain has not been clarified yet. The purpose of this study was to evaluate the relationship between the whole-body distribution of intravenously administered 11C-Donepezil (DNP) and the AChE activity in the normal rat, with special focus on the adrenal glands. Methods The distribution of 11C-DNP was investigated by PET/CT in 6 normal male Wistar rats (8 weeks old, body weight = 220±8.9 g). A 30-min dynamic scan was started simultaneously with an intravenous bolus injection of 11C-DNP (45.0±10.7 MBq). The whole-body distribution of the 11C-DNP PET was evaluated based on the Vt (total distribution volume) by Logan-plot analysis. A fluorometric assay was performed to quantify the AChE activity in homogenized tissue solutions of the major organs. Results The PET analysis using Vt showed that the adrenal glands had the 2nd highest level of 11C-DNP in the body (following the liver) (13.33±1.08 and 19.43±1.29 ml/cm3, respectively), indicating that the distribution of 11C-DNP was the highest in the adrenal glands, except for that in the excretory organs. The AChE activity was the third highest in the adrenal glands (following the small intestine and the stomach) (24.9±1.6, 83.1±3.0, and 38.5±8.1 mU/mg, respectively), indicating high activity of AChE in the adrenal glands. Conclusions We demonstrated the whole-body distribution of 11C-DNP by PET and the AChE activity in the major organs by fluorometric assay in the normal rat. High accumulation of 11C-DNP was observed in the adrenal glands, which suggested the risk of enhanced cholinergic synaptic transmission by the use of AChE inhibitors.
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Affiliation(s)
- Tadashi Watabe
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- * E-mail:
| | | | - Hayato Ikeda
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Genki Horitsugi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Yasukazu Kanai
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Kayako Isohashi
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Mana Ishibashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiroki Kato
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Eku Shimosegawa
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiroshi Watabe
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Jun Hatazawa
- PET molecular Imaging Center, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan
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Yoshimoto M, Hirata M, Kanai Y, Naka S, Nishii R, Kagawa S, Kawai K, Ohmomo Y. Monitoring of Gefitinib Sensitivity with Radioiodinated PHY Based on EGFR Expression. Biol Pharm Bull 2014; 37:355-60. [DOI: 10.1248/bpb.b13-00559] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Mitsuyoshi Yoshimoto
- Division of Functional Imaging, National Cancer Center Hospital East
- Faculty of Health Sciences, Kanazawa University
| | | | - Yasukazu Kanai
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine
| | - Sadahiro Naka
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine
| | - Ryuichi Nishii
- Department of Radiology, Faculty of Medicine, University of Miyazaki
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Shimizu T, Sonoda H, Murata S, Takebayashi K, Ohta H, Miyake T, Mekata E, Shiomi H, Naka S, Tani T. Hyperthermic intraperitoneal chemotherapy using a combination of mitomycin C,5-fluorouracil, and oxaliplatin in patients at high risk of colorectal peritoneal metastasis: A Phase I clinical study. Eur J Surg Oncol 2013; 40:521-528. [PMID: 24388411 DOI: 10.1016/j.ejso.2013.12.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 11/15/2013] [Accepted: 12/05/2013] [Indexed: 01/19/2023] Open
Abstract
INTRODUCTION The drugs and protocols used for hyperthermic intraperitoneal chemotherapy (HIPEC) vary among institutions. Here we show the efficacy of the 3-drug combination of mitomycin C (MMC), 5-fluorouracil (5FU), and oxaliplatin (OHP) in an in vitro simulation of HIPEC and the safety of HIPEC with these drugs during a Phase I study of patients at high risk of developing colorectal peritoneal metastasis. METHODS To simulate HIPEC, we used HCT116 and WiDr cells to assess the growth inhibitory efficacy of MMC 2 μg/mL, 5FU 200 μg/mL, and OHP 40 μg/mL as single drugs or their combination after an exposure time of 30 min at 37 or 42 °C. In addition, nine patients underwent surgical resection of tumors and HIPEC with MMC, 5FU, and an escalating dose of OHP (90/110/130 mg/m²). Dose-limiting toxicity was monitored. RESULTS In the simulation, the 3-drug combination showed marked tumor-suppressive effects compared with those from ten times higher dose of OHP 400 μg/mL, with significant augmentation under hyperthermic conditions. No dose-limiting toxicity occurred in the clinical study. Dose escalation was completed at the final level of OHP. CONCLUSIONS The MMC-5FU-OHP combination showed marked growth inhibition against colorectal cancer cells under hyperthermic conditions in vitro. In the phase I study, the recommended dose of OHP was determined as 130 mg/m² when used with MMC and 5FU; HIPEC using MMC-5FU-OHP appears to be safe and feasible for patients at high risk of colorectal peritoneal metastasis.
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Affiliation(s)
- T Shimizu
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan.
| | - H Sonoda
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - S Murata
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - K Takebayashi
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - H Ohta
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - T Miyake
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - E Mekata
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - H Shiomi
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - S Naka
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
| | - T Tani
- Department of Surgery, Shiga University of Medical Science, Seta-Tsukinowacho, Otsu, Shiga 520-2192, Japan
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Hirata M, Kanai Y, Naka S, Yoshimoto M, Kagawa S, Matsumuro K, Katsuma H, Yamaguchi H, Magata Y, Ohmomo Y. A useful EGFR-TK ligand for tumor diagnosis with SPECT: development of radioiodinated 6-(3-morpholinopropoxy)-7-ethoxy-4-(3'-iodophenoxy)quinazoline. Ann Nucl Med 2013; 27:431-43. [PMID: 23494210 PMCID: PMC3672506 DOI: 10.1007/s12149-013-0703-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 02/06/2013] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Epidermal growth factor receptor tyrosine kinase (EGFR-TK) represents an attractive target for tumor diagnosis agents. Previously, radioiodinated 4-(3-iodophenoxy)-6,7-diethoxyquinazoline (PHY) was reported to possess good characteristics as a tumor imaging agent. We have explored the feasibility of developing tumor diagnosis ligands superior to radioiodinated PHY. METHODS New phenoxyquinazoline derivatives were designed with various side chains introduced to the 6th position of PHY. The IC50 values of the new derivatives to interrupt EGFR-TK phosphorylation were evaluated and compared to well-known EGFR-TK inhibitors. Tumor uptake studies of the new (125)I-labeled derivatives were conducted with A431 tumor-bearing mice. Selectivity and binding characteristics were analyzed by in vitro blocking studies and a binding assay. Furthermore, SPECT/CT scans were performed using A431 tumor-bearing mice. RESULTS Six quinazoline derivatives were designed and synthesized, and among these, 6a-d were found to have relatively high EGFR-TK inhibitory potency. In tumor uptake studies, [(125)I]6a ([(125)I]PYK) was found to have the highest tumor uptake and longest retention in tumors. In contrast, [(125)I]PYK was rapidly cleared from peripheral tissues, resulting in a high tumor-to-tissue ratio 24 h after injection. Moreover, the EGFR-TK selectivity of [(125)I]PYK was confirmed by pretreatment experiments with specific EGFR-TK inhibitors. Furthermore, [(125)I]PYK provided clear SPECT images of tumors. CONCLUSIONS Radioiodinated PYK, one of the newly synthesized quinazoline derivatives, was found to be a desirable ligand for EGFR-TK SPECT imaging. [(125)I]PYK showed high tumor accumulation and selective EGFR-TK binding and also succeeded in delivering high contrast imaging of tumors. These favorable characteristics of [(125)I]PYK suggest that the (123)I-labeled counterpart, [(123)I]PYK, would have great potential for diagnostic SPECT tumor imaging.
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Affiliation(s)
- Masahiko Hirata
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
| | - Yasukazu Kanai
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Yamadaoka 2-2, Osaka Suita, 565-0871 Japan
| | - Sadahiro Naka
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Yamadaoka 2-2, Osaka Suita, 565-0871 Japan
| | - Mitsuyoshi Yoshimoto
- Functional Imaging Division, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Chiba Kashiwa, 277-8577 Japan
| | - Shinya Kagawa
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
- Research Institute, Shiga Medical Center 5-4-30 Moriyama, Shiga Moriyama, 524-8524 Japan
| | - Keiji Matsumuro
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
| | - Hideyuki Katsuma
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
| | - Hiroshi Yamaguchi
- Department of Molecular Imaging, Applied Medical Photonics Laboratory, Medical Photonics Research Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, 431-3192 Japan
| | - Yasuhiro Magata
- Department of Molecular Imaging, Applied Medical Photonics Laboratory, Medical Photonics Research Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, 431-3192 Japan
| | - Yoshiro Ohmomo
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Osaka Takatsuki, 569-1094 Japan
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Kojima A, Nomura R, Naka S, Okawa R, Ooshima T, Nakano K. Aggravation of inflammatory bowel diseases by oral streptococci. Oral Dis 2013; 20:359-66. [PMID: 23679203 DOI: 10.1111/odi.12125] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Revised: 04/18/2013] [Accepted: 04/20/2013] [Indexed: 12/01/2022]
Abstract
OBJECTIVES Streptococcus mutans can aggravate colitis in mice. We evaluated the virulence of colitis using type strains as well as blood isolates of several oral streptococcal species. MATERIALS AND METHODS We investigated the susceptibility of blood isolates of several oral streptococci to phagocytosis, adhesion to and invasion of hepatic cells and interferon-γ secretion. A mouse model of dextran sodium sulphate-induced colitis was used to evaluate bacterial aggravation of colitis. In addition, interferon-γ antibody was administered to mice with prominent aggravation of colitis. RESULTS In vitro analyses showed that Streptococcus sanguinis ATCC 10556 was a possible virulent strain among type strains of several oral streptococci, and that analysis of blood isolates of S. sanguinis TW289 revealed a potential virulent strain. Intravenous administration of ATCC 10556 and TW289 caused prominent aggravation of dextran sodium sulphate-induced colitis, and histopathological examinations showed that interferon-γ secretion due to infection of hepatic cells caused colitis aggravation. Administration of interferon-γ antibody suppressed TW289-induced colitis. CONCLUSION These results suggest that some virulent oral streptococcal strains are associated with the aggravation of colitis induced by enhanced secretion of interferon-γ when they invade the bloodstream.
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Affiliation(s)
- A Kojima
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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Isohashi K, Shimosegawa E, Kato H, Kanai Y, Naka S, Fujino K, Watabe H, Hatazawa J. Optimization of [11C]methionine PET study: appropriate scan timing and effect of plasma amino acid concentrations on the SUV. EJNMMI Res 2013; 3:27. [PMID: 23587060 PMCID: PMC3637362 DOI: 10.1186/2191-219x-3-27] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 03/24/2013] [Indexed: 11/18/2022] Open
Abstract
Background [11C]methionine (MET) has been used to monitor amino acid metabolism in tumors, the pancreas, liver, and myocardium. The aim of the present study was to standardize [11C]MET positron emission tomography (PET) by optimizing the timing of initiation of the scan and applying correction to the plasma concentrations of neutral amino acids (NAAs), where necessary. Methods Sequential whole-body MET PET/computed tomography (CT) was performed in 11 normal adults after they had fasted for at least 4 h. After whole-body CT for attenuation correction and intravenous bolus injection of MET, the subjects were scanned from the parietal to the groin. The scanning was repeated six to seven times. Decay of radioactivity during the PET scan was corrected to the time of initiation of the first scan. The standardized uptake values (SUVs) were evaluated in various organs by setting regions of interest on the tomographic images. Plasma concentrations of NAAs were examined in relation to the SUV values. Results The SUVs in the pancreas reached their plateau from 6.5 to 11 min after the MET injection, and in the brain, lung, and myocardium, they reached their plateau from 19.6 to 24.1 min. The MET uptake in the spleen and kidney peaked early after the injection and steadily decreased thereafter. The SUVs in the liver and stomach wall rapidly increased during the first 0 to 4.5 min and gradually elevated thereafter during the scan period. Urinary radioactivity in the bladder reached its plateau from 26.1 to 30.6 min after the MET injection. There were no correlations between the plasma concentrations of NAAs and the maximal SUV in any organs. Conclusions The present study revealed the times taken to reach the plateau of MET uptake in various important organs, and little effects of the plasma neutral amino acid concentrations on the SUVs in PET studies conducted after the patients had fasted for at least 4 h. In the MET PET study, 4 h fasting period before MET administration and the scan initiation 20 min after MET administration provide the SUV values independent of scan initiation time and the plasma neutral amino acid concentrations.
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Affiliation(s)
- Kayako Isohashi
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita City, Osaka 565-0871, Japan.
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Iseki K, Arima H, Kohagura K, Komiya I, Ueda S, Tokuyama K, Shiohira Y, Uehara H, Toma S, Tomiyama N, Arima H, Chinen S, Tokashiki K, Hirano-Nakasone A, Nohara C, Ueda S, Ueda S, Kohagura K, Toma S, Tana T, Higa A, Yamazato M, Ishida Y, Tokuyama K, Nagayoshi N, Miyagi S, Asato T, Kobayashi R, Shiohira Y, Yonaha T, Uezu Y, Kuwae N, Nakasato S, Oshiro Y, Nashiro K, Asato T, Katsuren H, Kagawa H, Naika-Geka K, Higa T, Ikema M, Akamine K, Nishihira M, Jahana M, Imai C, Yonaha T, Ikemura M, Uechi M, Yamazato M, Yoshihara K, Arakaki M, Iha K, Afuso H, Kiyuna S, Shiroma K, Miyara T, Itokazu M, Naka T, Naka S, Yamaguchi E, Uechi Y, Kowatari T, Yamada H, Yoshi S, Sunagawa H, Tozawa M, Uechi M, Adaniya M, Afuso H, Uehara H, Miyazato H, Sakuda C, Taminato T, Uchima H, Nakasone Y, Funakoshi T, Nakazato M, Nagata N, Miyazato S, Katsuren H, Miyagi T, Hirano H, Iwashiro K, Sunagawa T, Yoshida H, Oshiro Y, Shimabukuro T, Oura T, Henzan H, Kyan I, Maeshiro S, Wake T, Tagawa S, Inoue T, Tokashiki T, Ishii H, Miyagi S, Takishita S, Saito S, Shimizu K, Ohya Y, Barzi F. Effects of angiotensin receptor blockade (ARB) on mortality and cardiovascular outcomes in patients with long-term haemodialysis: a randomized controlled trial. Nephrol Dial Transplant 2013; 28:1579-89. [DOI: 10.1093/ndt/gfs590] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Nomura R, Naka S, Nemoto H, Inagaki S, Taniguchi K, Ooshima T, Nakano K. Potential involvement of collagen-binding proteins of Streptococcus mutans in infective endocarditis. Oral Dis 2012; 19:387-93. [PMID: 22998492 DOI: 10.1111/odi.12016] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 08/13/2012] [Accepted: 08/20/2012] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Streptococcus mutans, a major pathogen of dental caries, is considered to be one of the causative agents of infective endocarditis (IE). Two types of cell surface collagen-binding proteins, Cnm and Cbm, have been identified in the organism. The aim of the present study was to analyze these proteins as possible etiologic factors for IE. MATERIALS AND METHODS The binding activities of S. mutans strains to collagen types I, III, and IV were analyzed relative to the presence of Cnm and Cbm, as were their adhesion and invasion properties with human umbilical vein endothelial cells (HUVEC). In addition, distributions of the genes encoding Cnm and Cbm in S. mutans-positive heart valve specimens extirpated from IE and non-IE patients were analyzed by PCR. RESULTS Most of the Cbm-positive strains showed higher levels of binding to type I collagen as well as higher rates of adhesion and invasion with HUVEC as compared to the Cnm-positive strains. Furthermore, the gene encoding Cbm was detected significantly more frequently in heart valve specimens from IE patients than from non-IE patients. CONCLUSIONS These results suggest that the collagen-binding protein Cbm of S. mutans may be one of the potential important factor associated with the pathogenesis of IE.
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Affiliation(s)
- R Nomura
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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Nomura R, Nakano K, Naka S, Nemoto H, Masuda K, Lapirattanakul J, Alaluusua S, Matsumoto M, Kawabata S, Ooshima T. Identification and characterization of a collagen-binding protein, Cbm, in Streptococcus mutans. Mol Oral Microbiol 2012; 27:308-23. [DOI: 10.1111/j.2041-1014.2012.00649.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yamasaki Y, Nomura R, Nakano K, Naka S, Matsumoto-Nakano M, Asai F, Ooshima T. Distribution of periodontopathic bacterial species in dogs and their owners. Arch Oral Biol 2012; 57:1183-8. [PMID: 22417880 DOI: 10.1016/j.archoralbio.2012.02.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 02/06/2012] [Accepted: 02/13/2012] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Presently, a large number of individuals consider their companion animals as family members and have close contact with them in daily life. The purpose of the present study was to analyze the distribution of periodontopathic bacterial species in oral specimens taken from dogs and their owners. DESIGN Dental plaque specimens were collected from 66 dogs and 81 members of 64 families who came to an animal clinic or dog training school in Okayama, Japan, in 2011. Bacterial DNA was extracted from each specimen and PCR analyses using primers specific for 11 periodontopathic species, Porphyromonas gingivalis, Porphyromonas gulae, Treponema denticola, Tannerella forsythia, Capnocytophaga ochracea, Capnocytophaga sputigena, Prevotella intermedia, Prevotella nigrescens, Aggregatibacter actinomycetemcomitans, Campylobacter rectus, and Eikenella corrodens were performed. RESULTS P. gulae (71.2%), T. forsythia (77.3%), and C. rectus (66.7%) were frequently found in the dogs, whereas the detection rates of those species in humans were less frequent at 16.0%, 30.9%, and 21.0%, respectively. P. gulae was identified in 13 human subjects and each of their dogs was also positive for the species. Furthermore, E. corrodens and T. denticola in specimens obtained from dogs were correlated with their presence in specimens from owners who had close contact with them. CONCLUSIONS These results suggest that several periodontopathic species could be transmitted between humans and their companion dogs, though the distribution of periodontopathic species in both is generally different.
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Affiliation(s)
- Y Yamasaki
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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Kodaira S, Yasuda N, Kawashima H, Kurano M, Naka S, Ota S, Ideguchi Y, Hasebe N, Ogura K. Detection threshold control of CR-39 plastic nuclear track detectors for the selective measurement of high LET secondary charged particles. RADIAT MEAS 2011. [DOI: 10.1016/j.radmeas.2011.08.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nakano K, Wada K, Nomura R, Nemoto H, Inaba H, Kojima A, Naka S, Hokamura K, Mukai T, Nakajima A, Umemura K, Kamisaki Y, Yoshioka H, Taniguchi K, Amano A, Ooshima T. Characterization of aortic aneurysms in cardiovascular disease patients harboring Porphyromonas gingivalis. Oral Dis 2010; 17:370-8. [PMID: 21029263 DOI: 10.1111/j.1601-0825.2010.01759.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE Porphyromonas gingivalis was recently shown to cause intimal hyperplasia in a mouse model by a novel cholesterol-independent mechanism, suggesting to be a pathogen-specific feature of cardiovascular diseases. The aim of this study was to characterize the clinical and histopathological features of aortic aneurysms in cardiovascular disease patients harboring oral P. gingivalis. SUBJECT AND METHODS Aortic aneurysm specimens were collected from 76 Japanese patients who underwent surgery, of whom dental plaque specimens were also collected from 31 patients. Bacterial DNA was extracted from each specimen to detect P. gingivalis by polymerase chain reaction. Histopathological analyses of the aortic aneurysm specimens, including immunohistochemical staining for embryonic myosin heavy chain isoform (SMemb) and S100 calcium-binding protein A9 (S100A9), were also performed. RESULTS The number of aneurysms occurring in the distal aorta was significantly higher in subjects positive for P. gingivalis in dental plaque compared with those who were negative. The expressions of S100A9 and SMemb were also significantly greater in the subjects positive for P. gingivalis in dental plaque. On the other hand, there were no significant differences in adipocellular accumulation between the groups. CONCLUSIONS These results suggest that aortic aneurysms in patients harboring oral P. gingivalis have greater expression of S100A9 and proliferative smooth muscle cells, which was different from the present patients without oral P. gingivalis.
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Affiliation(s)
- K Nakano
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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Nakano K, Nomura R, Taniguchi N, Lapirattanakul J, Kojima A, Naka S, Senawongse P, Srisatjaluk R, Grönroos L, Alaluusua S, Matsumoto M, Ooshima T. Molecular characterization of Streptococcus mutans strains containing the cnm gene encoding a collagen-binding adhesin. Arch Oral Biol 2009; 55:34-9. [PMID: 20005510 DOI: 10.1016/j.archoralbio.2009.11.008] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Revised: 11/10/2009] [Accepted: 11/15/2009] [Indexed: 10/20/2022]
Abstract
OBJECTIVE Streptococcus mutans, known to be a major pathogen of dental caries, is also considered to cause infective endocarditis. Its 120-kDa Cnm protein binds to type I collagen, which may be a potential virulence factor. In this study, we characterized S. mutans clinical strains focusing on the cnm gene encoding Cnm. DESIGN A total of 528 S. mutans strains isolated from Japanese, Finnish, and Thai subjects were investigated. Using molecular techniques, the distribution frequency of cnm-positive strains and location of the inserted cnm were analyzed. Furthermore, isogenic mutant strains were constructed by inactivation of the cnm gene, then their biological properties of collagen-binding and glucan-binding were evaluated. Southern hybridization of the genes encoding glucan-binding proteins was also performed. RESULTS The distribution frequency of cnm-positive strains from Thai subjects was 12%, similar to that previously reported for Japanese and Finnish subjects. Furthermore, the location of insertion of cnm was the same in all cnm-positive clinical isolates. As for the cnm-inactivated mutant strains constructed from 28 clinical isolates, their collagen-binding activity was negligible. In addition, glucan-binding activity in the cnm-positive clinical isolates was significantly reduced and corresponded to a lack of gbpA encoding glucan-binding protein A. CONCLUSIONS Our results indicate that strains with cnm genes, the most crucial factor for the collagen-binding property of S. mutans, are detectable at similar frequencies over several different geographic locations. In addition, the common properties of these strains are a high level of collagen-binding activity and tendency for a low level of glucan-binding activity.
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Affiliation(s)
- K Nakano
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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Murata S, Naito H, Yamamoto H, Mekata E, Shimizu T, Shiomi H, Naka S, Abe H, Kurumi Y, Tani T. Phase II trial of adjuvant hyperthermic intraperitoneal chemotherapy with three drugs for the prophylactic treatment of carcinomatosis after resection of advanced gastric cancer. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e15588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e15588 Background: This prospective study was performed to assess the efficacy and safety of hyperthermic intraperitoneal chemotherapy (HIPEC) with three drugs in patients with curative resection of T3 or T4 advanced gastric cancer. Methods: Patients with curative resection of clinically T3 or T4 advanced gastric cancer were required to be under 75 years of age and to have adequate organ function. After the curative resection of gastric cancer with D2 lymph node dissection and the reconstruction of the alimentary tract, HIPEC was carried out for 30 minutes with 50mg of CDDP, 10mg of MMC, and 1000mg of 5-FU in 5 L saline maintained at 42–43°C. Patients were given an adjuvant S-1 treatment after surgery. Primary endpoint of this study was overall survival. Results: A total of 29 patients were eligible. Pathologically, 8 patients had sub-serosal invasion (pT2(ss)), 18 patients had serosal invasion (pT3), and 3 patients had adjacent organ invasion (pT4). These patients included pT2(ss)pN0 (n=2), pT2(ss)pN1 (n=6), pT3pN0 (n=4), pT3pN1 (n=9), pT3pN2 (n=5), pT4pN0 (n=1), and pT4pN1 (n=2). Median follow-up period was 44 months (10–72 months). Overall 5- year survival rate in all eligible patients was 89.5%. Overall 5-year survival rate in patients with pT2(ss), pT3, or pT4 was 100%, 82.4%, or 100%, respectively. Three patients with pT3 had recurrence of pleural dissemination (n=1), lymph node metastases (n=1), or pulmonary metastases and peritoneal dissemination (n=1). A total of 7 patients had postoperative complications such as continuous pancreatic juice secretion (13.8%), abdominal abscess (10.3%), leakage of the anastomosis (3.4%), and pulmonary insufficiency (10.3%). Conclusions: The present study suggests that HIPEC with three drugs after curative resection of advanced gastric primary cancer is associated with improved overall survival with an acceptable morbidity. No significant financial relationships to disclose.
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Affiliation(s)
- S. Murata
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - H. Naito
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - H. Yamamoto
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - E. Mekata
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - T. Shimizu
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - H. Shiomi
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - S. Naka
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - H. Abe
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - Y. Kurumi
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
| | - T. Tani
- Shiga University of Medical Science, Otsu, Japan; Shiga University of Medical Science, Otsu, Japan
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Kakihara N, Takeshita K, Naka S, Ishibashi H. Gastric Submucosa as the Safer and Repeatable Site for Hepatocyte Transplantation. Transplant Proc 2009; 41:425-8. [DOI: 10.1016/j.transproceed.2008.10.069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 09/22/2008] [Accepted: 10/20/2008] [Indexed: 10/21/2022]
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Abe H, Shimizu T, Naka S, Shiomi H, Demura K, Murakami K, Kurumi Y, Morikawa S, Tani T. Open-configuration magnetic resonance (MR) guided microwave thermocoagulation treatment for breast tumors: Preliminary report of hepatic metastases and resected breast tumors. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.11095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
11095 Background: Minimally invasive therapies such as radiofrequency ablation, focused ultrasound surgery, and cryotherapy for early stage primary breast cancers may be appropriate in carefully selected patients. In this study, open-configuration magnetic resonance (MR)-guided microwave thermocoagulation treatment was used for breast tumors, and the efficacy of this treatment was assessed. Methods: We used MR-guided microwave thermocoagulation treatment on eight patients with metastatic liver tumors from breast cancer. A 0.5 T open-configuration MR system and a microwave coagulator were used. Near-real-time MR images and real-time temperature images were collected and displayed on the monitor. Secondly, it was examined whether the description of breast tumors was possible with open- configuration MR device, and simulated a tumor puncture while imaging a real-time MR image. The resected breast tumor was punctured while confirming the tumor with open-configuration MR system, and microwave thermocoagulation was enforced. Tumor tissue viability after microwave thermocoagulation was assessed by hematoxylin and eosin and NADH vital staining. Results: The visibility of the tumor by MR imaging was not disturbed throughout the procedure. In 8 patients, 11 hepatic metastases were treated by MR-guided microwave thermocoagulation treatment successfully without any major adverse event. Five of the 8 patients are alive with new metastatic foci with a mean observation period of 25.9 months (range 1 - 43 months). It was able to be confirmed that viability of the tumor had disappeared by the microwave thermocoagulation in resected breast tumors. Conclusions: This technique is feasible and safe to treatment of breast tumor with real-time observation. Open-configuration MR-guided microwave thermocoagulation therapy appears to be a feasible method with advantages to add to the growing list for nonsurgical ablation therapy of early stage primary breast cancer and should be investigated in further comparative studies. No significant financial relationships to disclose.
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Affiliation(s)
- H. Abe
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - T. Shimizu
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - S. Naka
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - H. Shiomi
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - K. Demura
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - K. Murakami
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Y. Kurumi
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - S. Morikawa
- Shiga University of Medical Science, Otsu, Shiga, Japan
| | - T. Tani
- Shiga University of Medical Science, Otsu, Shiga, Japan
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Crecy AD, Bourret A, Naka S, Lasalmonie A. High resolution determination of the core structure of 1/3⟨1120⟩ {1010} edge dislocation in titanium. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418618308245221] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yanagië H, Kobayashi H, Takeda Y, Yoshizaki I, Nonaka Y, Naka S, Nojiri A, Shinnkawa H, Furuya Y, Niwa H, Ariki K, Yasuhara H, Eriguchi M. Inhibition of growth of human breast cancer cells in culture by neutron capture using liposomes containing 10B. Biomed Pharmacother 2002; 56:93-9. [PMID: 12000141 DOI: 10.1016/s0753-3322(01)00161-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cell destruction in boron neutron capture therapy is effected by nuclear reaction between 10B and thermal neutrons with the release of alpha-particles (4He) and lithium-7 ions (7Li). 4He kills cells within 10 microm of the site of 4He generation, therefore it is theoretically possible to destroy tumour cells without affecting adjacent healthy tissue, given selective delivery of compounds containing 10B. Liposomes wore prepared by vortex dispersion of solutions containing 10B compounds with dried lipid films and the effects of those compounds on human breast cancer cells in culture were examined after thermal neutral irradiation. [3H]-TdR incorporation by MRKnu/nu-1 cells treated with 10B-containing liposomes showed 40% suppression compared with liposomes without 10B, at 2 x 1012 n/cm2 thermal neutron fluence. Inhibition of tumour cell growth with liposomes prepared with 100 mm 10B-compound was as significant as with those made with 500 ppm 10B solution. The concentration of 10B in liposomes was 76.5 +/- 3.4 microg/mL. Boronated liposomes can thus deliver sufficient 10B atoms to this line of breast cancer cells in culture to effect cytotoxicity and suppression of growth after thermal neutron irradiation.
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Affiliation(s)
- H Yanagië
- Department of Surgery, Teikyo University School of Medicine Ichihara Hospital, Chiba, Japan.
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Ishigami F, Naka S, Takeshita K, Kurumi Y, Hanasawa K, Tani T. Bile salt tauroursodeoxycholic acid modulation of Bax translocation to mitochondria protects the liver from warm ischemia-reperfusion injury in the rat. Transplantation 2001; 72:1803-7. [PMID: 11740392 DOI: 10.1097/00007890-200112150-00016] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Tauroursodeoxycholic acid (TUDC) is a hydrophilic bile acid that has a cytoprotective effect in primary biliary cirrhosis and primary sclerosing cholangitis. TUDC also protects hepatocytes from hydrophobic bile acid-induced apoptosis. The aim of this study was to determine whether TUDC ameliorates hepatocyte apoptosis during ischemia-reperfusion injury. METHODS We used a rat model of hepatic warm ischemia-reperfusion injury to assess the effects of TUDC. Male Sprague-Dawley rats were subjected to 1 or 2 hr of normothermic ischemia followed by 3 or 6 hr of reperfusion. The treatment group received TUDC (50 mg/kg) by bolus intravenous injection 30 min before initiation of ischemia, whereas the control group received saline only. Blood samples for biochemical analysis were obtained after 6 hr of reperfusion. Liver biopsies for histological assessment were obtained 3 and 6 hr after reperfusion. Hepatocyte apoptosis was determined by terminal dUTP nick-end labeling. The pro-apoptotic protein Bax was quantified at the mRNA and protein level. RESULTS Treatment with TUDC significantly reduced serum transaminase levels. This was associated with a significant amelioration in the levels of hepatocyte apoptosis in the TUDC-treated group compared with control. Furthermore, Western blot analysis of Bax expression in liver tissue indicated that TUDC inhibited the translocation of Bax from the cytosol to the mitochondria. CONCLUSIONS TUDC significantly reduced hepatic injury in this model. The beneficial effects of TUDC upon hepatocyte apoptosis were related to the modulation of Bax protein translocation.
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Affiliation(s)
- F Ishigami
- First Department of Surgery, Shiga University of Medical Science, Seta-tsukinowacho, Otsu, Shiga 520-2192, Japan
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Naka S, Kurumi Y, Shimizu T, Kondo H, Mekata E, Naito H, Kawaguchi A, Abe H, Endo Y, Hanasawa K, Tani T, Morikawa S, Ishizuka Y, Yamazaki M, Furukawa K. [Tumor ablation with MRI navigation--a novel method of microwave coagulation therapy for hepatic tumor]. Gan To Kagaku Ryoho 2001; 28:1591-4. [PMID: 11707987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Fifty-eight patients with hepatic tumor which consisted of 22 hepatocellular carcinomas and 36 metastatic liver tumors were treated by microwave coagulation therapy with MRI navigation. The tumors were located in all segments of liver except S1. In 24 cases among them, the abdominal approach was difficult, because the tumors were located just below the diaphragm. These cases were selected for thoracoscope-assisted microwave ablation under MR-guidance across the diaphragm. All MR data were collected on a vertically oriented open MRI system (0.5 T SIGNA SP/i system: GE Medical Systems). The microwave electrode was introduced into the liver through a 14G needle via a percutaneous puncture with real-time MR image navigation. Microwave ablations at 60 W for 60 seconds were repeated several times depending on the tumor size. MR imaging may be employed as a reliable guide for percutaneous puncture. Moreover, sufficient safety margin could be obtained for hepatic tumor ablation. MR-guided microwave thermoablation therapy is a feasible method of treatment for hepatic tumors.
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Affiliation(s)
- S Naka
- 1st. Dept. of Surgery, Shiga University of Medical Science
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Abstract
OBJECTIVES To analyse the relationship between vascular trauma and associated injuries to intra-thoracic and abdominal organs caused by traffic accidents. Design retrospective study in a university hospital. MATERIALS AND METHODS We investigated 458 consecutive patients who were admitted with blunt thoracic and/or abdominal trauma caused by road traffic accidents between 1986 and 1999. Vascular trauma was encountered in 54 patients (12%). RESULTS The injured vessels were located in the abdomen in 45 patients and in the chest in nine patients. Mesenteric vessels were the most frequently injured vessels (33/45) in the abdomen, while the aorta and major vessels were most frequently injured (9/9) in the chest. Injury to the large/small intestine was often associated with mesenteric vessel injury (26/27). In the 190 patients with blunt abdominal organ injury, the frequency of mesenteric vessel injury was also highest, regardless of the injured organ. Vascular reconstruction was necessary only in one of 51 patients who underwent operation. CONCLUSIONS Our results demonstrate that the mesenteric vessels are susceptible to blunt thoracic and abdominal trauma in road traffic accidents. Vascular reconstruction may be indicated for selected patients as long as the injuries to hollow organs are assessed carefully because of their strong association with vascular injury.
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Affiliation(s)
- H Yasuhara
- Department of Surgery, Teikyo University Ichihara Hospital, 3426-3 Anesaki, Ichihara City, Chiba, 299-0111, Japan
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46
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Atagi S, Kawahara M, Hosoe S, Ogawara M, Ishikawa H, Kawaguchi T, Kamitani A, Okishio K, Nobuyama S, Naka S, Sunami T, Mitsuoka S. A phase II study of continuous concurrent thoracic radiotherapy (TRT) in combination with mitomycin (M), vindesine (V) and cisplatin (P) in unresectable stage III non-small cell lung cancer (NSCLC). Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80381-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Shinkawa H, Yasuhara H, Naka S, Kuroda T, Nojiri T, Fujita T, Ishida Y, Nagao K, Wada N. Gastric carcinoma presenting with extensive extraluminal growth: report of a case. Surg Today 2000; 30:432-4. [PMID: 10819479 DOI: 10.1007/s005950050617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We report a 48-year-old-man with gastric carcinoma presenting with an unusual extraluminal growth. The patient underwent a barium meal examination and gastrofiberscopy because of progressive anemia over 6 months. These examinations revealed a Borrmann type 3 advanced gastric carcinoma of the greater curvature of the antrum. Biopsies showed moderately differentiated tubular adenocarcinoma. The intraoperative findings showed gastric carcinoma associated with extensive extraluminal invasion into the adjacent organs, i.e., the transverse colon and mesocolon. A palliative distal gastrectomy with a partial resection of the transverse colon was performed because of peritoneal dissemination found in the mesocolon and rectovesical pouch. A histological examination of the specimen confirmed adenocarcinoma which had massively infiltrated the transverse colon and mesocolon. His postoperative course was uneventful. However, he died of peritonitis carcinomatosa 9 months later.
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Affiliation(s)
- H Shinkawa
- Department of Surgery, Ichihara Hospital, Teikyo University School of Medicine, Chiba, Japan
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48
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Abstract
A case of tuberculous peritonitis, which has been scarcely encountered in clinical practice in recent years, is reported. A 32-year-old man was admitted to our hospital complaining of abdominal fullness, anorexia, and a 15 kg weight loss. His abdomen was distended. There was neither any previous history nor recent contact with tuberculosis. The laboratory data indicated increased C-reactive protein and erythrocyte sedimentation rate, but the white blood cell count was normal. A chest X-ray examination revealed no abnormalities. Abdominal X-ray showed scattered, small-intestinal gas shadows. Abdominal computed tomography scanning revealed a diffuse thickening of the dilated bowel wall, mainly adjacent to the mesentery. After a detailed examination a diagnosis of peritonitis carcinomatosa of unknown origin was suspected, and an exploratory laparotomy was done. Severe adhesions between the parietal peritoneum and the bowel were found. An excisional biopsy specimen was taken from the peritoneum, and a diagnosis of tuberculosis was thus made. Triple therapy with isoniazid, rifampicin, and kanamycin was started, and both the intestinal obstruction and anorexia were thus resolved.
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Affiliation(s)
- M Hasegawa
- Department of Surgery, Ichihara Hospital, Teikyo University School of Medicine, Chiba, Japan
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49
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Naka S, Minakata M, Tatamiya T, Kimura H, Kumegawa M, Ishida N, Takeya T. Activation of human CAII gene promoter by v-Src: existence of Ras-dependent and -independent pathways. Biochem Biophys Res Commun 2000; 272:808-15. [PMID: 10860835 DOI: 10.1006/bbrc.2000.2838] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Carbonic anhydrase II (CAII) catalyzes the reversible hydration of carbon dioxide and plays key roles in acid base homeostasis in mammals. We found that human CAII gene promoter could be activated in human cells such as HeLa and T47D cells when the CAII promoter-luciferase gene was transfected with v-Src and assayed as a reporter of the promoter activity. Kinase negative mutants of Src, in contrast, showed little activation. The activation was completely suppressed with the introduction of a dominant-negative Ras in T47D cells, while no suppression was observed in HeLa cells. Introduction of various kinds of deletions into the CAII promoter revealed two essential regions responsible for this activation. No activation, however, was observed in activated Fyn-transfected human cells or in v-Src-transfected rodent cells. These findings suggest that Src can modulate the human CAII promoter by exerting its tyrosine kinase activity in certain human cells, and that two types of Src signaling pathways, Ras-dependent and -independent, exist in a cell type dependent manner.
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Affiliation(s)
- S Naka
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan
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Hyodo C, Tanaka T, Kobayashi M, Shimizu M, Prueksunand P, Nitithamyong A, Jittawatanakorn J, Naka S. Factors affecting attitudes towards mother-to-child transmission of HIV among pregnant women in a maternal and child hospital in Thailand. Int J STD AIDS 2000; 11:406-9. [PMID: 10872915 DOI: 10.1258/0956462001915994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study determines the factors which correlate with attitudes towards mother-to-child transmission of HIV in pregnant women. Using a structured questionnaire, 527 pregnant women who visited a hospital to have prenatal checkups were interviewed. The survey items were: sociodemographic characteristics, experiences of pre-test counselling, knowledge of mother-to-child transmission, and attitude towards termination of pregnancy. Results showed that many pregnant women (80%) did not have proper knowledge of the possibility of mother-to-child transmission. Logistic regression analysis also indicates that age and knowledge of the possibility of mother-to-child transmission were the significant determinants of attitudes towards termination of pregnancy. Older women who believe that all the babies of pregnant women with HIV will be infected are most likely to terminate their pregnancy when they are diagnosed as HIV positive. Considering the importance of informed decisions regarding pregnancy, this study must have important implications for future support programmes for HIV-positive pregnant women.
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Affiliation(s)
- C Hyodo
- Department of Health Education, University of Tokyo, Japan
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