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Park S, Demizu Y, Suga M, Taniguchi S, Tanaka S, Maehata I, Takeda M, Takahashi D, Matsuo Y, Sulaiman NS, Terashima K, Tokumaru S, Furukawa K, Okimoto T. Predicted probabilities of brain injury after carbon ion radiotherapy for head and neck and skull base tumors in long-term survivors. Radiother Oncol 2021; 165:152-158. [PMID: 34718054 DOI: 10.1016/j.radonc.2021.10.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 10/13/2021] [Accepted: 10/18/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND AND PURPOSE We aimed to determine the risk factors for radiation-induced brain injury (RIBI1) after carbon ion radiotherapy (CIRT) to predict their probabilities in long-term survivors. MATERIALS AND METHODS We evaluated 104 patients with head, neck, and skull base tumors who underwent CIRT in a regimen of 32 fractions and were followed up for at least 24 months. RIBI was assessed using the Common Terminology Criteria for Adverse Events. RESULTS The median follow-up period was 45.5 months; 19 (18.3 %) patients developed grade ≥2 RIBI. The maximal absolute dose covering 5 mL of the brain (D5ml) was the only significant risk factor for grade ≥2 RIBI in the multivariate logistic regression analysis (p = 0.001). The tolerance doses of D5ml for the 5% and 50% probabilities of developing grade ≥2 RIBI were estimated to be 55.4 Gy (relative biological effectiveness [RBE]) and 68.4 Gy (RBE) by a logistic model, respectively. CONCLUSION D5ml was most significantly associated with grade ≥2 RIBI and may enable the prediction of its probability.
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Affiliation(s)
- SungChul Park
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan.
| | - Yusuke Demizu
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan; Department of Radiation Oncology, Hyogo Ion Beam Medical Center Kobe Proton Center, Japan
| | - Masaki Suga
- Department of Radiation Physics, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Shingo Taniguchi
- Department of Radiation Technology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Shinichi Tanaka
- Department of Radiation Technology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Itsumi Maehata
- Department of Radiation Technology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Mikuni Takeda
- Department of Radiation Technology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Daiki Takahashi
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Yoshiro Matsuo
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | | | - Kazuki Terashima
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Sunao Tokumaru
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
| | - Kyoji Furukawa
- Biostatistics Center, Kurume University Graduate School of Medicine, Fukuoka, Japan
| | - Tomoaki Okimoto
- Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan
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Seki R, Wakisaka Y, Morimoto N, Takashina M, Koizumi M, Toki H, Fukuda M. Physics of epi-thermal boron neutron capture therapy (epi-thermal BNCT). Radiol Phys Technol 2017; 10:387-408. [DOI: 10.1007/s12194-017-0430-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 11/07/2017] [Indexed: 10/18/2022]
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Biologically Effective Dose (BED) Correlation With Biochemical Control After Low–Dose Rate Prostate Brachytherapy for Clinically Low-Risk Prostate Cancer. Int J Radiat Oncol Biol Phys 2010; 77:139-46. [DOI: 10.1016/j.ijrobp.2009.04.052] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 04/08/2009] [Accepted: 04/22/2009] [Indexed: 11/23/2022]
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Rangel A, Dunscombe P. Tolerances on MLC leaf position accuracy for IMRT delivery with a dynamic MLC. Med Phys 2009; 36:3304-9. [DOI: 10.1118/1.3134244] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Miles EF, Nelson JW, Alkaissi AK, Das S, Clough RW, Anscher MS, Oleson JR. Equivalent uniform dose, D90, and V100 correlation with biochemical control after low-dose-rate prostate brachytherapy for clinically low-risk prostate cancer. Brachytherapy 2008; 7:206-11. [DOI: 10.1016/j.brachy.2008.01.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2007] [Revised: 01/07/2008] [Accepted: 01/09/2008] [Indexed: 11/25/2022]
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