PRSOR09 Presentation Time: 12:40 PM

Purpose: Incorporation of brachytherapy (BT) into the radiation management of prostate cancer has been guided by the use of risk stratification derived for external beam (EBRT) treatment. This raises questions about the appropriateness of EBRT risk groups for BT of prostate cancer. The purpose of this work was to derive risk groups for low dose rate (LDR) monotherapy of prostate cancer, compare them with those used for EBRT, and test for significant differences in clinical failure-free survival (CFFs) between patients in the same EBRT risk group.