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Wakatsuki T, Ishizuka N, Hironaka S, Minashi K, Kadowaki S, Goto M, Shoji H, Hirano H, Nakayama I, Osumi H, Ogura M, Chin K, Yamaguchi K, Takahari D. Exploratory analysis of serum HER2 extracellular domain for HER2 positive gastric cancer treated with SOX plus trastuzumab. Int J Clin Oncol 2024; 29:801-812. [PMID: 38589679 PMCID: PMC11130043 DOI: 10.1007/s10147-024-02509-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 03/06/2024] [Indexed: 04/10/2024]
Abstract
BACKGROUND The aim of this study was to explore the clinical utility of serum HER2 extracellular domain (sHER2 ECD) using data from a clinical trial evaluating trastuzumab combined S-1 plus oxaliplatin (SOX) in HER2 positive gastric cancer. METHODS sHER2 ECD were prospectively measured at baseline and subsequent treatment courses. Based on each quantile point of baseline sHER2 ECD levels and its early changes, patients were divided into two groups and compared clinical outcomes. RESULTS 43 patients were enrolled, and 17 patients (39.5%) were positive for baseline sHER2 ECD. Higher baseline sHER2 ECD levels tended to have lower hazard ratios (HRs). When divided into two groups by baseline sHER2 ECD of 19.1 ng/ml, median progression-free survival (PFS) and overall survival (OS) was longer in the higher group (mPFS: 16.8 vs 8.7 months, p = 0.359. mOS: 35.5 vs 20.6 months, p = 0.270), respectively. After initiation of treatment, sHER2 ECD significantly decreased up until the third cycle. Higher reduction rates of sHER2 ECD within 3 cycles also tended to have lower HRs. When divided into two groups by reduction rate of 42.5%, mPFS and mOS was longer in the higher reduced group (mPFS: 17.2 vs 8.7 months, p = 0.095. mOS: 65.0 vs 17.8 months, p = 0.047), respectively. Furthermore, higher reduction rates could surrogate higher objective response rates (ORR) (ORR: 90% vs 63.2% for 29.5%, p = 0.065. 100% vs 70% for 42.5%, p = 0.085), respectively. CONCLUSIONS Baseline sHER2 ECD levels and its early decline may be useful biomarkers for SOX plus trastuzumab efficacy in HER2 positive gastric cancer.
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Affiliation(s)
- Takeru Wakatsuki
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan.
| | - Naoki Ishizuka
- Department of Clinical Trial Planning, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Shuichi Hironaka
- Clinical Trial Promotion Department, Chiba Cancer Center, Chiba, Japan
- Department of Medical Oncology, Faculty of Medicine, Kyorin University, Tokyo, Japan
| | - Keiko Minashi
- Clinical Trial Promotion Department, Chiba Cancer Center, Chiba, Japan
| | - Shigenori Kadowaki
- Department of Clinical Oncology, Aichi Cancer Center Hospital, Nagoya, Japan
| | - Masahiro Goto
- Cancer Chemotherapy Center, Osaka Medical and Pharmaceutical University Hospital, Osaka, Japan
| | - Hirokazu Shoji
- Department of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Hidekazu Hirano
- Department of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Izuma Nakayama
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan
| | - Hiroki Osumi
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan
| | - Mariko Ogura
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan
| | - Keisho Chin
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan
| | - Kensei Yamaguchi
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan
| | - Daisuke Takahari
- Department of Gastrointestinal Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-Ku, Tokyo, 135-8550, Japan
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Lee JY, Park MJ. The Role of Serum CD26 in the Diagnosis of Gastric Cancer. Int J Gen Med 2022; 15:7179-7187. [PMID: 36118182 PMCID: PMC9481300 DOI: 10.2147/ijgm.s378620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 09/07/2022] [Indexed: 11/23/2022] Open
Abstract
Purpose The value of serum cluster of differentiation 26 (CD26) in gastric cancer remains unknown. We investigated serum CD26 as a non-invasive serological marker for the diagnosis of gastric cancer and its relationship with serum human epidermal growth factor receptor-2 (HER2) levels. Patients and Methods We enrolled 393 gastric cancer patients treated with endoscopic resection or surgery, and 90 healthy controls. HER2 positivity in tissue was evaluated by immunohistochemistry staining, and the serum CD26 and HER2 levels were measured using an enzyme-linked immunosorbent assay. Results Serum CD26 levels were significantly lower in gastric cancer patients than in healthy controls (582.2 ± 254.3 vs 862.7 ± 410.6 ng/mL, P<0.001). Serum CD26 levels were significantly lower in advanced gastric cancer compared to early gastric cancer (642.2 ± 333.9 vs 503.4 ± 332.7 ng/mL, P<0.001), and tended to decrease with gastric cancer progression. To diagnose gastric cancer, the optimal cut-off value of serum CD26 was 762.7 ng/mL with 75.6% sensitivity and 64.4% specificity. Serum CD26 levels were weakly correlated with serum HER2 levels (rs=0.363, P<0.001). However, no difference in serum CD26 levels was observed between tissue HER2-negative and HER2-positive gastric cancer groups (586.2 ± 362.1 vs 579.6 ± 264.8 ng/mL, P=0.898). Conclusion CD26 is a useful non-invasive serological marker for gastric cancer diagnosis; however, its levels do not correlate with HER2 status.
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Affiliation(s)
- Ju Yup Lee
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu, South Korea
- Institute for Cancer Research, Keimyung University, Daegu, South Korea
| | - Mae-Ja Park
- Department of Anatomy, School of Medicine, Kyungpook National University, Daegu, South Korea
- Correspondence: Mae-Ja Park, Department of Anatomy, School of Medicine, Kyungpook National University, Daegu, South Korea, Tel/Fax +82-53-420-4802, Email
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Jathal MK, Steele TM, Siddiqui S, Mooso BA, D'Abronzo LS, Drake CM, Whang YE, Ghosh PM. Dacomitinib, but not lapatinib, suppressed progression in castration-resistant prostate cancer models by preventing HER2 increase. Br J Cancer 2019; 121:237-248. [PMID: 31209328 PMCID: PMC6738116 DOI: 10.1038/s41416-019-0496-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 05/14/2019] [Accepted: 05/24/2019] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Despite overexpression of the ErbB (EGFR/HER2/ErbB3/ErbB4) family in castration-resistant prostate cancer (CRPC), some inhibitors of this family, including the dual EGFR/HER2 inhibitor lapatinib, failed in Phase II clinical trials. Hence, we investigated mechanisms of lapatinib resistance to determine whether alternate ErbB inhibitors can succeed. METHODS The CWR22 human tumour xenograft and its CRPC subline 22Rv1 and sera from lapatinib-treated CRPC patients from a previously reported Phase II trial were used to study lapatinib resistance. Mechanistic studies were conducted in LNCaP, C4-2 and 22Rv1 cell lines. RESULTS Lapatinib increased intratumoral HER2 protein, which encouraged resistance to this treatment in mouse models. Sera from CRPC patients following lapatinib treatment demonstrated increased HER2 levels. Investigation of the mechanism of lapatinib-induced HER2 increase revealed that lapatinib promotes HER2 protein stability, leading to membrane localisation, EGFR/HER2 heterodimerisation and signalling, elevating cell viability. Knockdown of HER2 and ErbB3, but not EGFR, sensitised CRPC cells to lapatinib. At equimolar concentrations, the recently FDA-approved pan-ErbB inhibitor dacomitinib decreased HER2 protein stability, prevented ErbB membrane localisation (despite continued membrane integrity) and EGFR/HER2 heterodimerisation, thereby decreasing downstream signalling and increasing apoptosis. CONCLUSIONS Targeting the EGFR axis using the irreversible pan-ErbB inhibitor dacomitinib is a viable therapeutic option for CRPC.
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Affiliation(s)
- Maitreyee K Jathal
- Department of Urology, University of California Davis, Sacramento, CA, United States
| | - Thomas M Steele
- Department of Urology, University of California Davis, Sacramento, CA, United States
| | - Salma Siddiqui
- VA Northern California Health Care System, Mather, CA, United States
| | - Benjamin A Mooso
- VA Northern California Health Care System, Mather, CA, United States
| | - Leandro S D'Abronzo
- Department of Urology, University of California Davis, Sacramento, CA, United States
| | - Christiana M Drake
- Department of Statistics, University of California Davis, Davis, CA, United States
| | - Young E Whang
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, United States
| | - Paramita M Ghosh
- Department of Urology, University of California Davis, Sacramento, CA, United States.
- VA Northern California Health Care System, Mather, CA, United States.
- Department of Biochemistry-Molecular Medicine, University of California Davis, Sacramento, CA, United States.
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Miura Y, Sukawa Y, Hironaka S, Mori M, Nishikawa K, Tokunaga S, Okuda H, Sakamoto T, Taku K, Nishikawa K, Moriwaki T, Negoro Y, Kimura Y, Uchino K, Shinozaki K, Shinozaki H, Musha N, Yoshiyama H, Tsuda T, Miyata Y, Sugimoto N, Shirakawa T, Ito M, Yonesaka K, Yoshimura K, Boku N, Nosho K, Takano T, Hyodo I. Five-weekly S-1 plus cisplatin therapy combined with trastuzumab therapy in HER2-positive gastric cancer: a phase II trial and biomarker study (WJOG7212G). Gastric Cancer 2018; 21:84-95. [PMID: 28497176 DOI: 10.1007/s10120-017-0725-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 04/29/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND Five-weekly S-1 plus cisplatin (SP) therapy is the standard care for advanced gastric or esophagogastric junction cancer (GC/EGJC) in East Asia. However, its efficacy and safety when combined with trastuzumab therapy for human epidermal growth factor receptor 2 (HER2)-positive advanced GC/EGJC remains unclear. METHODS Patients received 5-weekly SP therapy (S-1 at 40-60 mg twice daily for 21 days plus cisplatin at 60 mg/m2 on day 8, every 5 weeks) plus trastuzumab therapy (first dose of 8 mg/kg, then 6 mg/kg every 3 weeks). The primary end point was the response rate, and the secondary end points included progression-free survival, overall survival, safety, and serum biomarker levels. RESULTS Forty-four patients were enrolled. The response rate, progression-free survival, and overall survival were 61% (95% confidence interval 46-76%), 5.9 months, and 16.5 months respectively. The commonest grade 3 or grade 4 adverse events were neutropenia (30%) and anorexia (25%). A significantly higher response rate (92% vs 43%; P = 0.008) and longer progression-free survival (median 14.5 months vs 4.2 months; P = 0.028) were observed in patients with high (n = 14) compared with low (n = 17) pretreatment serum neuregulin 1 levels. CONCLUSIONS Five-weekly SP therapy combined with trastuzumab therapy showed a good antitumor response and acceptable toxicity in HER2-positive advanced GC/EGJC. Serum neuregulin 1 might be associated with the efficacy of this treatment regimen.
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Affiliation(s)
- Yuji Miura
- Department of Medical Oncology, Toranomon Hospital, 2-2-2 Toranomon Minato-ku, Tokyo, 105-8470, Japan
| | - Yasutaka Sukawa
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Shuichi Hironaka
- Clinical Trial Promotion Department, Chiba Cancer Center, 666-2 Nitona-Cho Chuo-ku, Chiba, 260-8717, Japan
| | - Misuzu Mori
- Department of Clinical Oncology, Jichi Medical University Hospital, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
| | - Kazuhiro Nishikawa
- Department of Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi Sumiyoshi-ku, Osaka, 558-0056, Japan
| | - Shinya Tokunaga
- Department of Medical Oncology, Osaka City General Hospital, 2-13-22 Miyakojima-hondori Miyakojima-ku, Osaka, 534-0021, Japan
| | - Hiroyuki Okuda
- Department of Medical Oncology, Keiyukai Sapporo Hospital, Kita 1-1 Hon-dori 14 chome, Shiroishi-ku, Sapporo, Hokkaido, 003-0027, Japan
| | - Takeshi Sakamoto
- Department of Gastroenterological Oncology, Hyogo Cancer Center, 13-70 Kitaoji-cho, Akashi, Hyogo, 673-0021, Japan
| | - Keisei Taku
- Department of Medical Oncology, Shizuoka General Hospital, 4-27-1 Kita Ando Aoi-ku, Shizuoka, 420-8527, Japan
| | - Kazuo Nishikawa
- Department of Medical Oncology and Hematology, Oita University Faculty of Medicine, 1-1 Hasamamachi Idaigaoka, Yufu, Oita, 879-5503, Japan
| | - Toshikazu Moriwaki
- Division of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai Tsukuba, Ibaraki, 305-8575, Japan
| | - Yuji Negoro
- Department of Gastroenterology, Kochi Health Sciences Center, 2125-1 Ike, Kochi, 781-8555, Japan
| | - Yutaka Kimura
- Department of Surgery, Sakai City Medical Center, 1-1-1 Ebaraji-cho Nishi-ku, Sakai, Osaka, 593-8304, Japan
| | - Keita Uchino
- Department of Medical Oncology, Kyushu Medical Center, 1-8-1 Jigyohama Chuo-ku, Fukuoka, 810-8563, Japan
| | - Katsunori Shinozaki
- Division of Clinical Oncology, Hiroshima Prefectural Hospital, 1-5-54 Ujinakanda Minami-ku, Hiroshima, 734-0004, Japan
| | - Hiroharu Shinozaki
- Department of Surgery, Saiseikai Utsunomiya Hospital, 911-1 Takebayashimachi Utsunomiya, Tochigi, 321-0974, Japan
| | - Nobuyuki Musha
- Department of Surgery, Saiseikai Niigata Daini Hospital, 280-7 Teraji Nishi-ku, Niigata, 950-1104, Japan
| | - Hirotsugu Yoshiyama
- Department of Gastroenterological Surgery, Ehime Prefectural Central Hospital, 83 Kasugamachi, Matsuyama, Ehime, 790-0024, Japan
| | - Takashi Tsuda
- Department of Clinical Oncology, School of Medicine, St Marianna University, 2-16-1 Sugao Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan
| | - Yoshinori Miyata
- Department of Medical Oncology, Saku Central Hospital Advanced Care Center, 3400-28 Nakagomi, Saku, Nagano, 385-0051, Japan
| | - Naotoshi Sugimoto
- Department of Clinical Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi Higashinari-ku, Osaka, 537-8511, Japan
| | - Tsuyoshi Shirakawa
- Department of Oncology, Miyazaki Prefectural Miyazaki Hospital, 5-30 Kitatakamatsucho, Miyazaki, 880-8510, Japan
| | - Miki Ito
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine, Sapporo, S1 W17, Chuo-ku, Hokkaido, 060-8556, Japan
| | - Kimio Yonesaka
- Department of Medical Oncology, Kindai University Faculty of Medicine, 377-2 Ohno-higashi Osaka-sayama, Osaka, 589-8511, Japan
| | - Kenichi Yoshimura
- Innovative Clinical Research Center, Kanazawa University Hospital, 13-1 Takaramachi, Kanazawa, Ishikawa, 920-0934, Japan
| | - Narikazu Boku
- Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, 5-1-1 Tsukiji Chuo-ku, Tokyo, 104-0045, Japan
| | - Katsuhiko Nosho
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, S1 W16, Chuo-ku, Sapporo, Hokkaido, 060-8543, Japan
| | - Toshimi Takano
- Department of Medical Oncology, Toranomon Hospital, 2-2-2 Toranomon Minato-ku, Tokyo, 105-8470, Japan
| | - Ichinosuke Hyodo
- Division of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai Tsukuba, Ibaraki, 305-8575, Japan
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Broughton MN, Westgaard A, Paus E, Øijordsbakken M, Henanger KJ, Naume B, Bjøro T. Specific antibodies and sensitive immunoassays for the human epidermal growth factor receptors (HER2, HER3, and HER4). Tumour Biol 2017; 39:1010428317707436. [PMID: 28653892 DOI: 10.1177/1010428317707436] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The use of trastuzumab in patients with breast cancer that overexpresses human epidermal growth factor receptor 2 has significantly improved treatment outcomes. However, a substantial proportion of this patient group still experiences progression of the disease after receiving the drug. Evaluation of the changes in expression of the human epidermal growth factor receptors could be of interest. Monoclonal antibodies against the extracellular domain of the human growth factor receptors, 2, 3, and 4, have been raised, and specific and sensitive immunoassays have been established. Sera from healthy individuals (Nordic Reference Interval Project and Database) were analyzed in the human epidermal growth factor receptor 2 assay (N = 805) and the human epidermal growth factor receptor 3 and 4 assays (N = 114), and reference limits were calculated. In addition, sera from 208 individual patients with breast cancer were tested in all three assays. Finally, the human epidermal growth factor receptor 2 assay was compared with a chemiluminescent immunoassay for serum human epidermal growth factor receptor 2/neu. Reference values were as follows: human epidermal growth factor receptor 2, <2.5 µg/L; human epidermal growth factor receptor 3, <2.8 µg/L; and human epidermal growth factor receptor 4, <1.8 µg/L. There were significant differences in human epidermal growth factor receptor 2 and human epidermal growth factor receptor 3 serum levels between the patients with tissue human epidermal growth factor receptor 2-positive and tissue human epidermal growth factor receptor 2-negative ( p = 0.0026, p = 0.000011) tumors, but not in the serum levels of human epidermal growth factor receptor 4 ( p = 0.054). There was good agreement between the in-house human epidermal growth factor receptor 2 assay and the chemiluminescent immunoassay. Our new specific antibodies for all the three human epidermal growth factor receptors may prove valuable in the development of novel anti-human epidermal growth factor receptor targeted therapies with sensitive immunoassays for measuring serum levels of the respective targets and in monitoring established treatment.
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Affiliation(s)
| | - Arne Westgaard
- 2 Department of Oncology, Radiumhospitalet, Oslo University Hospital, Oslo, Norway
| | - Elisabeth Paus
- 1 Department of Medical Biochemistry, Radiumhospitalet, Oslo University Hospital, Oslo, Norway
| | - Miriam Øijordsbakken
- 1 Department of Medical Biochemistry, Radiumhospitalet, Oslo University Hospital, Oslo, Norway
| | - Karoline J Henanger
- 1 Department of Medical Biochemistry, Radiumhospitalet, Oslo University Hospital, Oslo, Norway
| | - Bjørn Naume
- 2 Department of Oncology, Radiumhospitalet, Oslo University Hospital, Oslo, Norway.,3 Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Trine Bjøro
- 1 Department of Medical Biochemistry, Radiumhospitalet, Oslo University Hospital, Oslo, Norway.,3 Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
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Monteiro JP, Predabon SM, Bonafé EG, Martins AF, Brolo AG, Radovanovic E, Girotto EM. SPR platform based on image acquisition for HER2 antigen detection. NANOTECHNOLOGY 2017; 28:045206. [PMID: 27997366 DOI: 10.1088/1361-6528/28/4/045206] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
HER2 antigen is a marker used for breast cancer diagnosis and prevention. Its determination has great importance since breast cancer is one of the most insidious types of cancer in women. HER2 antigen assessment in human serum is traditionally achieved by enzyme-linked immunosorbent assay (ELISA method), but it has some disadvantages, such as suppressing the thermodynamic-kinetic studies regarding the antibody-antigen interaction, and the use of labeled molecules that can promote false positive responses. Biosensors based on surface plasmon resonance (SPR) are sensitive optical techniques widely applied on bioassays. The plasmonic devices do not operate with labeled molecules, overcoming conventional immunoassay limitations, and enabling a direct detection of target analytes. In this way, a new SPR biosensor to assess HER2 antigen has been proposed, using nanohole arrays on a gold thin film by signal transduction of transmitted light measurements from array image acquisitions. These metallic nanostructures may couple the light directly on surface plasmons using a simple collinear arrangement. The proposed device reached an average sensitivity for refractive index (RI) variation on a metal surface of 4146 intensity units/RIU (RIU = RI units). The device feasibility on biomolecular assessment was evaluated. For this, 3 ng ml-1 known HER2 antigen concentration was efficiently flowed (using a microfluidic system) and detected from aqueous solutions. This outcome shows that the device may be a powerful apparatus for bioassays, particularly toward breast cancer diagnosis and prognosis.
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Affiliation(s)
- Johny P Monteiro
- Materials Chemistry and Sensors Laboratories, Department of Chemistry, State University of Maringá, Colombo Avenue 5790, 87020-900, Maringá, PR, Brazil
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Saito M, Kawakami Y, Yamashita K, Nasuno H, Ishimine YU, Fukuda K, Isshiki H, Suzuki R, Arimura Y, Shinomura Y. HER2-positive gastric cancer identified by serum HER2: A case report. Oncol Lett 2016; 11:3575-3578. [PMID: 27284358 PMCID: PMC4887934 DOI: 10.3892/ol.2016.4470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 02/05/2016] [Indexed: 01/29/2023] Open
Abstract
Immunohistochemistry (IHC) and fluorescence in situ hybridization (FISH) are the current standards methods for the determination of tissue human epidermal growth factor receptor 2 (HER2) status in gastric cancer, as for breast cancer. However, HER2-positive gastric cancer occasionally exhibits heterogeneous tissue HER2 overexpression, raising concern regarding false-negative results in unresectable cases diagnosed by biopsy samples. Serum HER2, the concentration of the extracellular domain of HER2 protein shed into the bloodstream, has the potential to supplement the use of IHC or FISH to determine HER2 status. However, the clinical significance of serum HER2 has not been well studied in gastric cancer. The present study describes an illustrative case of metastatic gastric cancer initially diagnosed as HER2-negative (IHC score 1+). The patient exhibited an elevated serum HER2 level, which prompted a reevaluation of the tissue by IHC, using an alternative antibody, and FISH; re-biopsy analyses confirmed the case as HER2-positive, and trastuzumab was subsequently added to the combination chemotherapy with capecitabine and cisplatin. Serum HER2 may aid in avoiding false-negative diagnoses of HER2 gastric cancer.
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Affiliation(s)
- Mayuko Saito
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Yujiro Kawakami
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Kentaro Yamashita
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Hiroshi Nasuno
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Y U Ishimine
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Koichiro Fukuda
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Hiroyuki Isshiki
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Ryo Suzuki
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Yoshiaki Arimura
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
| | - Yasuhisa Shinomura
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University, Sapporo, Hokkaido 060-8543, Japan
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