Long-term clinical outcomes after 12-fractionated carbon-ion radiotherapy for localized prostate cancer.

Autor: Sato H; Department of Radiation Oncology, Faculty of Medicine, Yamagata University, Yamagata, Japan., Kasuya G; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Ishikawa H; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Nomoto A; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Ono T; Department of Radiation Oncology, Faculty of Medicine, Yamagata University, Yamagata, Japan.; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Nakajima M; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Isozaki Y; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Yamamoto N; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan., Iwai Y; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan.; Department of Radiology, Graduate School of Medicine, Chiba University, Chiba, Japan., Nemoto K; Department of Radiation Oncology, Faculty of Medicine, Yamagata University, Yamagata, Japan., Ichikawa T; Department of Urology, Graduate School of Medicine, Chiba University, Chiba, Japan., Tsuji H; Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology (formerly the National Institute of Radiological Science Hospital), QST Hospital, Chiba, Japan.
Jazyk: angličtina
Zdroj: Cancer science [Cancer Sci] 2021 Sep; Vol. 112 (9), pp. 3598-3606. Date of Electronic Publication: 2021 Jul 09.
DOI: 10.1111/cas.15019
Abstrakt: There are no clinical reports of long-term follow-up after carbon-ion radiotherapy (CIRT) using a dose of 51.6 Gy (relative biological effectiveness [RBE]) in 12 fractions for localized prostate cancer, or of a comparison of clinical outcomes between passive and scanning beam irradiation. A total of 256 patients with localized prostate cancer who received CIRT at a dose of 51.6 Gy (RBE) in 12 fractions using two different beam delivery techniques (passive [n = 45] and scanning [n = 211]), and who were followed for more than 1 year, were analyzed. The biochemical relapse-free (bRF) rate was defined by the Phoenix definition, and the actuarial toxicity rates were evaluated using the Kaplan-Meier method. Of the 256 patients, 41 (16.0%), 111 (43.4%), and 104 (40.6%) were classified as low, intermediate, and high risk, respectively, after a median follow-up of 7.0 (range 1.1-10.4) years. Androgen deprivation therapy was performed in 212 patients (82.8%). The 5-year bRF rates of the low-, intermediate-, and high-risk patients were 95.1%, 90.9%, and 91.1%, respectively. The 5-year rates of grade 2 late gastrointestinal and genitourinary toxicities in all patients were 0.4% and 6.3%, respectively. No grade ≥3 toxicities were observed. There were no significant differences in the rates of bRF or grade 2 toxicities in patients who received passive irradiation versus scanning irradiation. Our long-term follow-up results showed that a CIRT regimen of 51.6 Gy (RBE) in 12 fractions for localized prostate cancer yielded a good therapeutic outcome and low toxicity rates irrespective of the beam delivery technique.
(© 2021 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.)
Databáze: MEDLINE
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