ESTRO 2025 - Abstract Book

S1951

Clinical - Urology

ESTRO 2025

Objectively, the volume of the bowel structures receiving 7Gy, 14Gy, and 25Gy showed no statistically significant difference between cases and controls. One in five patients treated with WP-SBRT using bowel bag dose constraints of V 7 <1500cc, V 14 <500cc, and V 25 <50cc had acute mild-moderate bowel toxicity. Conclusion: There was no significant difference in planned bowel doses for different bowel delineation methods in patients with prostate cancer treated with WP-SBRT with or without acute bowel toxicity. Bowel bag remains a simple yet robust method of bowel delineation.

Keywords: Pelvic SBRT, acute enteritis, bowel contouring