ESTRO 2025 - Abstract Book

S2064

Clinical - Urology

ESTRO 2025

Figure 1.- Biochemical failure by risk group (Low and intermediate risk curves overlap)

Conclusion: SBRT is a safe and effective treatment technique with excellent biochemical control, low late toxicity rates, and can be used in the public Chilean health-care system.

Keywords: prostate cancer, SBRT, toxicities

References: 1.- Tree AC, Ostler P, van der Voet H, Chu W, Loblaw A, Ford D, Tolan S, Jain S, Martin A, Staffurth J, Armstrong J, Camilleri P, Kancherla K, Frew J, Chan A, Dayes IS, Duffton A, Brand DH, Henderson D, Morrison K, Brown S, Pugh J, Burnett S, Mahmud M, Hinder V, Naismith O, Hall E, van As N; PACE Trial Investigators. Intensity-modulated radiotherapy versus stereotactic body radiotherapy for prostate cancer (PACE-B): 2-year toxicity results from an open-label, randomised, phase 3, non-inferiority trial. Lancet Oncol. 2022 Oct;23(10):1308-1320.

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Digital Poster Bladder Volume and Dose Variations in Two Image-Guided Radiotherapy Strategies: A Multicenter Retrospective Study Luping Wan 1,2 , Yin Jiang 1 , Xianggao Zhu 2 , Yihang Zhang 3 , Hao Wu 2 , Wei Zhao 1 1 School of Physics, Beihang University, Beijing, China. 2 Department of Radiotherapy, Peking University Cancer Hospital, Beijing, China. 3 Department of Radiotherapy, Shanghai General Hospital, Shanghai, China Purpose/Objective: This study systematically reviews bladder volume and dose variations in prostate cancer patients undergoing image-guided radiotherapy (IGRT). Material/Methods: Retrospective data were analyzed from 65 prostate cancer patients treated at two radiotherapy centers using cone beam CT (CBCT)-based IGRT. Center A implemented a strategy of performing CBCT scans during the first three fractions and subsequently every fifth fraction, while Center B performed CBCT scans at every fraction. A semi-