Bowel frequency might be tied to prostate stereotactic radiation (SBRT) fraction frequency. In the PATRIOT trial, men with low/intermediate risk prostate cancer treated with 40 Gy / 5 were randomized to treatments every other day or once weekly with a primary outcome of acute bowel toxicity. Weekly treatment significantly reduced the rate of moderate to severe problems with bowel movements from 57 to 20%, but these differences disappeared on longer follow-up. | Quon, Radiother Oncol 2018


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