The NRG Oncology GU-005 phase III trial demonstrated that stereotactic body radiotherapy (SBRT) delivered in five treatments over two weeks provides superior quality of life outcomes compared to standard 20-28 treatment regimens for intermediate-risk prostate cancer patients.
SBRT patients showed significantly better preservation of bowel function (35% vs. 44% decline, p=0.034), sexual function (34.3% vs. 43.9% decline at one year, p=0.026), and urinary control (25.9% vs. 34.7% incontinence at two years, p=0.023).
Disease-free survival rates remained comparable between treatment groups at three years (88.6% with SBRT vs. 92.1% with standard radiation), supporting SBRT as an effective alternative that reduces treatment time by more than 80%.
The findings are expected to establish five-treatment SBRT as the new standard of care for men with localized, intermediate-risk prostate cancer, benefiting tens of thousands of patients annually.