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Analysis of diaphragm movements to specify geometric uncertainties of respiratory gating near end-exhalation for irradiation fields involving the liver dome. Radiother Oncol 2022; 171:146-154. [DOI: 10.1016/j.radonc.2022.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 03/24/2022] [Accepted: 04/12/2022] [Indexed: 11/20/2022]
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2
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Yoo GS, Yu JI, Park HC. Current role of proton beam therapy in patients with hepatocellular carcinoma. INTERNATIONAL JOURNAL OF GASTROINTESTINAL INTERVENTION 2021. [DOI: 10.18528/ijgii210043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022] Open
Affiliation(s)
- Gyu Sang Yoo
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jeong Il Yu
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hee Chul Park
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Hiroshima Y, Fukumitsu N, Saito T, Numajiri H, Murofushi KN, Ohnishi K, Nonaka T, Ishikawa H, Okumura T, Sakurai H. Concurrent chemoradiotherapy using proton beams for unresectable locally advanced pancreatic cancer. Radiother Oncol 2019; 136:37-43. [PMID: 31015127 DOI: 10.1016/j.radonc.2019.03.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 02/25/2019] [Accepted: 03/11/2019] [Indexed: 12/25/2022]
Abstract
BACKGROUND AND PURPOSE We investigated clinical outcomes of proton beam concurrent chemoradiotherapy (CCRT) for unresectable, locally advanced pancreatic cancer (LAPC) patients. MATERIALS AND METHODS Records from 42 unresectable LAPC patients (21 male and 21 female, 39-83 years old) with IIB/III clinical staging of 1/41 treated by proton beam CCRT were retrospectively reviewed. Twelve patients received a conventional 50 Gray equivalents (GyE) in 25 fractions protocol and 30 others received a higher dose protocol of 54.0-67.5 GyE in 25-33 fractions. Gemcitabine or S-1 (Tegafur, Gimeracil and Oteracil) was used concurrently. Toxicity, overall survival (OS) and local control (LC) were examined. RESULTS Acute adverse events of grades 1, 2, 3 and 4 were found in 4, 15, 17 and 2 patients, respectively. All grade 3 and 4 events were hematologic. Late adverse events of grades 1 and 2 were found in 3 and 2 patients, respectively. No late adverse effects of grade 3 or higher were observed. The 1-year/2-year OS rates from the start of CCRT were 77.8/50.8% with median survival time (MST) of 25.6 months. The 1-year/2-year LC rate from CCRT start was 83.3/78.9% with a median time to local recurrence of more than 36 months. Total irradiation dose was the only significant factor in univariate analyses of OS and LC (p = 0.015 and 0.023, respectively). CONCLUSION Proton beam CCRT lengthened survival periods compared to previous photon CCRT data and higher dose irradiation prolonged LC and OS for unresectable LAPC patients. Proton beam therapy is therefore safe and effective in these cases.
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Affiliation(s)
- Yuichi Hiroshima
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan.
| | - Nobuyoshi Fukumitsu
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Takashi Saito
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Haruko Numajiri
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Keiko Nemoto Murofushi
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Kayoko Ohnishi
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Tetsuo Nonaka
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Hitoshi Ishikawa
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Toshiyuki Okumura
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Hideyuki Sakurai
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8575, Japan
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Yoo GS, Yu JI, Park HC. Proton therapy for hepatocellular carcinoma: Current knowledges and future perspectives. World J Gastroenterol 2018; 24:3090-3100. [PMID: 30065555 PMCID: PMC6064962 DOI: 10.3748/wjg.v24.i28.3090] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/28/2018] [Accepted: 06/25/2018] [Indexed: 02/06/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is the second leading cause of cancer-related death, as few patients can be treated with currently available curative local modalities. In patients with HCC where curative modalities are not feasible, radiation therapy (RT) has emerged as an alternative or combination therapy. With the development of various technologies, RT has been increasingly used for the management of HCC. Among these advances, proton beam therapy (PBT) has several unique physical properties that give it a finite range in a distal direction, and thus no exit dose along the beam path. Therefore, PBT has dosimetric advantages compared with X-ray therapy for the treatment of HCC. Indeed, various reports in the literature have described the favorable clinical outcomes and improved safety of PBT for HCC patients compared with X-ray therapy. However, there are some technical issues regarding the use of PBT in HCC, including uncertainty of organ motion and inaccuracy during calculation of tissue density and beam range, all of which may reduce the robustness of a PBT treatment plan. In this review, we discuss the physical properties, current clinical data, technical issues, and future perspectives on PBT for the treatment of HCC.
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Affiliation(s)
- Gyu Sang Yoo
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, South Korea
| | - Jeong Il Yu
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, South Korea
| | - Hee Chul Park
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, South Korea
- Department of Medical Device Management and Research, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul 06351, South Korea
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Fukumitsu N, Okumura T, Numajiri H, Takizawa D, Ohnishi K, Mizumoto M, Aihara T, Ishikawa H, Tsuboi K, Sakurai H. Follow-up study of liver metastasis from breast cancer treated by proton beam therapy. Mol Clin Oncol 2017; 7:56-60. [PMID: 28685076 DOI: 10.3892/mco.2017.1283] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Accepted: 03/17/2017] [Indexed: 02/07/2023] Open
Abstract
Liver metastasis from breast cancer (LMBC) is an incurable, fatal disease with a very poor prognosis. Although various local treatments have been applied, their clinical utility has not been established. The purpose of this study was to investigate the safety and effectiveness of proton beam therapy (PBT) for the treatment of patients with LMGC. A total of 8 female patients (aged 38-63 years) with LMBC who received PBT between 2002 and 2012 were retrospectively reviewed. Patients who had tumors confined to the liver were investigated, whereas patients with extrahepatic tumors were excluded. A total of 5 patients had solitary tumors and 3 had multiple tumors. The total irradiation dose was 66-72.6 Gray equivalent [Gy relative biological effectiveness (RBE)] and 2 patients received concurrent chemotherapy or hormone therapy. The overall and progression-free survival (OS and PFS) rates, local control (LC) rate and adverse effects were investigated. All the patients completed treatment without interruption and late adverse effects of grade >3 were not observed. The OS rate was 88/73/58%, the PFS rate was 50/25/0% and the LC rate was 86/86/86% at 1/3/5 years, respectively. Thus, PBT is a safe treatment and the OS and PFS rates are comparable to those with other local treatments. PBT may be considered as an effective local treatment option for the treatment of LMBC patients.
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Affiliation(s)
- Nobuyoshi Fukumitsu
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Toshiyuki Okumura
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Haruko Numajiri
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Daichi Takizawa
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Kayoko Ohnishi
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Masashi Mizumoto
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Teruhito Aihara
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Hitoshi Ishikawa
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Koji Tsuboi
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Hideyuki Sakurai
- Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
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Fukumitsu N, Nitta K, Terunuma T, Okumura T, Numajiri H, Oshiro Y, Ohnishi K, Mizumoto M, Aihara T, Ishikawa H, Tsuboi K, Sakurai H. Registration error of the liver CT using deformable image registration of MIM Maestro and Velocity AI. BMC Med Imaging 2017; 17:30. [PMID: 28472925 PMCID: PMC5418691 DOI: 10.1186/s12880-017-0202-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 04/20/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Understanding the irradiated area and dose correctly is important for the reirradiation of organs that deform after irradiation, such as the liver. We investigated the spatial registration error using the deformable image registration (DIR) software products MIM Maestro (MIM) and Velocity AI (Velocity). METHODS Image registration of pretreatment computed tomography (CT) and posttreatment CT was performed in 24 patients with liver tumors. All the patients received proton beam therapy, and the follow-up period was 4-14 (median: 10) months. We performed DIR of the pretreatment CT and compared it with that of the posttreatment CT by calculating the dislocation of metallic markers (implanted close to the tumors). RESULTS The fiducial registration error was comparable in both products: 0.4-32.9 (9.3 ± 9.9) mm for MIM and 0.5-38.6 (11.0 ± 10.0) mm for Velocity, and correlated with the tumor diameter for MIM (r = 0.69, P = 0.002) and for Velocity (r = 0.68, P = 0.0003). Regarding the enhancement effect, the fiducial registration error was 1.0-24.9 (7.4 ± 7.7) mm for MIM and 0.3-29.6 (8.9 ± 7.2) mm for Velocity, which is shorter than that of plain CT (P = 0.04, for both). CONCLUSIONS The DIR performance of both MIM and Velocity is comparable with regard to the liver. The fiducial registration error of DIR depends on the tumor diameter. Furthermore, contrast-enhanced CT improves the accuracy of both MIM and Velocity. INSTITUTIONAL REVIEW BOARD APPROVAL H28-102; July 14, 2016 approved.
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Affiliation(s)
- Nobuyoshi Fukumitsu
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan.
| | - Kazunori Nitta
- Division of Radiology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Japan
| | - Toshiyuki Terunuma
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Toshiyuki Okumura
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Haruko Numajiri
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Yoshiko Oshiro
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Kayoko Ohnishi
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Masashi Mizumoto
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Teruhito Aihara
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Hitoshi Ishikawa
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Koji Tsuboi
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
| | - Hideyuki Sakurai
- Proton Medical Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Japan
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Fukumitsu N, Okumura T, Takizawa D, Numajiri H, Ohnishi K, Mizumoto M, Aihara T, Ishikawa H, Tsuboi K, Sakurai H. Proton beam therapy for liver metastases from gastric cancer. JOURNAL OF RADIATION RESEARCH 2017; 58:357-362. [PMID: 27974509 PMCID: PMC5440857 DOI: 10.1093/jrr/rrw102] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 04/28/2016] [Indexed: 05/31/2023]
Abstract
Liver metastases from gastric cancer (LMGC) is a non-curable, fatal disease with a 5-year survival rate of <10%. Although various local treatments have been applied, their clinical utility has not been established. The purpose of this study was to investigate the safety and effectiveness of proton beam therapy (PBT) for the treatment of patients with LMGC. A total of nine patients (seven men, two women; aged 56-78 years) with LMGC who received PBT between 2002 and 2012 were retrospectively reviewed. Patients who had tumors confined to the liver were investigated, and patients who had extrahepatic tumors were excluded. Six of the patients had solitary tumors, and three patients had multiple tumors. The total irradiation dose was 64-77 Gy relative biological effectiveness (RBE), and three patients received concurrent chemotherapy. The overall and progression-free survival (OS and PFS) rates, local control (LC) rate, and adverse effects were investigated. All patients completed treatment without interruption, and late adverse effects of higher than Grade 3 were not observed. The OS rates at 1, 3 and 5 years were 100%, 78% and 56%, respectively (median, 5.5 years); the PFS rates were 67%, 40% and 40% (median, 2.6 years); and the LC rates were 89%, 71% and 71%. PBT was demonstrated to be a safe treatment, and the OS and PFS rates were not inferior to those for other types of local treatment. Therefore, PBT should be considered as an effective local treatment option for patients with LMGC.
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Affiliation(s)
- Nobuyoshi Fukumitsu
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Toshiyuki Okumura
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Daichi Takizawa
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Haruko Numajiri
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Kayoko Ohnishi
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Masashi Mizumoto
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Teruhito Aihara
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Hitoshi Ishikawa
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Koji Tsuboi
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
| | - Hideyuki Sakurai
- Proton Medical Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575, Japan
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Fukumitsu N, Okumura T, Takizawa D, Makishima H, Numajiri H, Murofushi K, Ohnishi K, Mizumoto M, Aihara T, Ishikawa H, Tsuboi K, Sakurai H. Proton beam therapy for metastatic liver tumors. Radiother Oncol 2015; 117:322-7. [PMID: 26385268 DOI: 10.1016/j.radonc.2015.09.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 09/01/2015] [Accepted: 09/06/2015] [Indexed: 12/26/2022]
Abstract
PURPOSE The purpose of this study was to investigate the safety and efficacy of proton beam therapy (PBT) for the treatment of metastatic liver tumors. MATERIAL AND METHODS A total of 140 patients with liver metastasis who received PBT were retrospectively investigated. The main primary tumor sites were the colorectum (60) and the pancreas (19). RESULTS One hundred thirty-three patients (95%) completed treatment. Two patients experienced late adverse effects (rib fracture and cholangitis). The 5-year overall survival (OS) rate was 24%. In the 85 patients with lesions confined to the liver, the 5-year OS rate of was 28%, and in the 55 patients with lesions both inside and outside the liver, it was 16% (P=0.007). Among the patients with lesions confined to the liver, the 5-year OS rate of the 62 patients who received curative treatment was 30%, and that of the 23 patients who received palliative treatment, 23% (P=0.016). Multivariate analysis showed that the treatment strategy (curative and palliative) alone was associated with the OS rate (P=0.02). CONCLUSION PBT is a potentially safe and effective treatment for metastatic liver tumors.
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Affiliation(s)
| | | | - Daichi Takizawa
- Proton Medical Research Center, University of Tsukuba, Japan
| | | | - Haruko Numajiri
- Proton Medical Research Center, University of Tsukuba, Japan
| | - Keiko Murofushi
- Proton Medical Research Center, University of Tsukuba, Japan
| | - Kayoko Ohnishi
- Proton Medical Research Center, University of Tsukuba, Japan
| | | | - Teruhito Aihara
- Proton Medical Research Center, University of Tsukuba, Japan
| | | | - Koji Tsuboi
- Proton Medical Research Center, University of Tsukuba, Japan
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CT-Guided Implantation of Intrahepatic Fiducial Markers for Proton Beam Therapy of Liver Lesions: Assessment of Success Rate and Complications. AJR Am J Roentgenol 2015; 204:W207-13. [DOI: 10.2214/ajr.14.12901] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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10
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Application of a deformable registration technique to investigate breath-hold reproducibility. Jpn J Radiol 2014; 32:700-7. [DOI: 10.1007/s11604-014-0369-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 10/23/2014] [Indexed: 10/24/2022]
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12
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Dionisi F, Widesott L, Lorentini S, Amichetti M. Is there a role for proton therapy in the treatment of hepatocellular carcinoma? A systematic review. Radiother Oncol 2014; 111:1-10. [DOI: 10.1016/j.radonc.2014.02.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 01/28/2014] [Accepted: 02/02/2014] [Indexed: 02/06/2023]
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13
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Ling TC, Kang JI, Bush DA, Slater JD, Yang GY. Proton therapy for hepatocellular carcinoma. Chin J Cancer Res 2013. [DOI: 10.1007/s11670-012-0276-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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14
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Yuan Y, Andronesi OC, Bortfeld TR, Richter C, Wolf R, Guimaraes AR, Hong TS, Seco J. Feasibility study of in vivo MRI based dosimetric verification of proton end-of-range for liver cancer patients. Radiother Oncol 2013; 106:378-82. [DOI: 10.1016/j.radonc.2013.01.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 11/08/2012] [Accepted: 01/06/2013] [Indexed: 11/27/2022]
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15
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Ling TC, Kang JI, Bush DA, Slater JD, Yang GY. Proton therapy for hepatocellular carcinoma. Chin J Cancer Res 2012; 24:361-7. [PMID: 23359779 PMCID: PMC3551328 DOI: 10.3978/j.issn.1000-9604.2012.10.09] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 10/24/2012] [Indexed: 12/26/2022] Open
Abstract
Proton radiotherapy has seen an increasing role in the treatment of hepatocellular carcinoma (HCC). Historically, external beam radiotherapy has played a very limited role in HCC due to a high incidence of toxicity to surrounding normal structures. The ability to deliver a high dose of radiation to the tumor is a key factor in improving outcomes in HCC. Advances in photon radiotherapy have improved dose conformity and allowed dose escalation to the tumor. However, despite these advances there is still a large volume of normal liver that receives a considerable radiation dose during treatment. Proton beams do not have an exit dose along the beam path once they enter the body. The inherent physical attributes of proton radiotherapy offer a way to maximize tumor control via dose escalation while avoiding excessive radiation to the remaining liver, thus increasing biological effectiveness. In this review we discuss the physical attributes and rationale for proton radiotherapy in HCC. We also review recent literature regarding clinical outcomes of using proton radiotherapy for the treatment of HCC.
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Affiliation(s)
- Ted C Ling
- Department of Radiation Medicine, Loma Linda University Medical Center, CA 92354, USA
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Fukumitsu N, Ishida M, Terunuma T, Mizumoto M, Hashimoto T, Moritake T, Okumura T, Sakae T, Tsuboi K, Sakurai H. Reproducibility of image quality for moving objects using respiratory-gated computed tomography: a study using a phantom model. JOURNAL OF RADIATION RESEARCH 2012; 53:945-53. [PMID: 22966173 PMCID: PMC3483843 DOI: 10.1093/jrr/rrs039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 04/22/2012] [Accepted: 05/28/2012] [Indexed: 05/24/2023]
Abstract
To investigate the reproducibility of computed tomography (CT) imaging quality in respiratory-gated radiation treatment planning is essential in radiotherapy of movable tumors. Seven series of regular and six series of irregular respiratory motions were performed using a thorax dynamic phantom. For the regular respiratory motions, the respiratory cycle was changed from 2.5 to 4 s and the amplitude was changed from 4 to 10 mm. For the irregular respiratory motions, a cycle of 2.5 to 4 or an amplitude of 4 to 10 mm was added to the base data (i.e. 3.5-s cycle, 6-mm amplitude) every three cycles. Images of the object were acquired six times using respiratory-gated data acquisition. The volume of the object was calculated and the reproducibility of the volume was decided based on the variety. The registered image of the object was added and the reproducibility of the shape was decided based on the degree of overlap of objects. The variety in the volumes and shapes differed significantly as the respiratory cycle changed according to regular respiratory motions. In irregular respiratory motion, shape reproducibility was further inferior, and the percentage of overlap among the six images was 35.26% in the 2.5- and 3.5-s cycle mixed group. Amplitude changes did not produce significant differences in the variety of the volumes and shapes. Respiratory cycle changes reduced the reproducibility of the image quality in respiratory-gated CT.
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