イタバシ　ミチオ   Itabashi Michio   板橋　道朗    所属   医学部 医学科（東京女子医科大学病院）    職種   特任教授
論文種別	原著
言語種別	英語
査読の有無	査読なし
表題	Carbon Ion Radiotherapy for Locally Recurrent Rectal Cancer of Patients with Prior Pelvic Irradiation.
掲載誌名	正式名：Annals of surgical oncology 略　 称：Ann Surg Oncol ISSNコード：15344681/10689265
掲載区分	国外
巻・号・頁	29(1),pp.99-106
著者・共著者	YAMADA Shigeru, TANIYAMA Hirotoshi, ISOZAKI Yuka, SHINOTO Makoto, Ebner Daniel K, KOTO Masashi, TSUJI Hiroshi, MIYAUCHI Hideaki, SEKIMOTO Mitsugu, UENO Hideki, ITABASHI Michio, IKEDA Masataka, MATSUBARA Hisahiro,
発行年月	2022/01
概要	BACKGROUND:This study aimed to assess the safety and efficacy of carbon-ion radiotherapy (CIRT) for salvage of previously X-ray-irradiated (XRT) locally recurrent rectal cancer (LRRC).METHODS:Between September 2005 and December 2017, 77 patients with LRRC were treated with CIRT re-irradiation. All the patients had received prior XRT with a median dose of 50.0 Gy (range 20-74 Gy), principally for neoadjuvant or adjuvant recurrence prophylaxis in 34 patients and for recurrence in 43 patients. The total CIRT dose of 70.4 Gy (RBE) (gray relative biologic effectiveness) was administered in 16 fixed fractions during 4 weeks (4.4 Gy [RBE] per fraction).RESULTS:All the patients completed the scheduled treatment course. None of the patients received resection after CIRT. Acute grade 3 toxicities occurred for eight patients (10 %), including five grade 3 pelvic infections (2 involving pain and 1 involving neuropathy). Late grade 3 toxicities occurred for 16 patients (21 %): 13 with late grade 3 pelvic infections, 9 with gastrointestinal toxicity, 1 with skin toxicity, 2 with pain, and 4 with neuropathy. No grade 4+ toxicity was noted. The overall local control rates (infield + out-of-field recurrence) were 69 % at 3 years and 62 % at 5 years. In the planning target volume (PTV), the infield recurrence rates were 90 % and 87 % respectively. The control rates for regional recurrence were 85 % at 3 years and 81 % at 5 years. The median overall survival time was 47 months. The survival rates were 61 % at 3 years and 38 % at 5 years.CONCLUSION:Carbon-ion re-irradiation of previously X-ray-irradiated locally recurrent rectal cancer appears to be safe and effective, providing good local control and survival advantage without unacceptable morbidity.
DOI	10.1245/s10434-021-10876-4
PMID	34664141