Abstract P2-11-01: Effects of radiotherapy on breast cancer outcomes among stage I, low-Recurrence risk, hormone-Sensitive breast cancer: Pooled analysis of individual data from phase III trials

Abstract Purpose: Radiotherapy after breast conservation has become the standard of care. Prior meta-analyses of radiotherapy benefits pre-dated availability of gene expression profiling (GEP) to assess recurrence risk and/or did not include all relevant outcomes. This analysis utilized GEP information with individual-level data from seven clinical trials to evaluate the impact of omitting radiotherapy on recurrence and …