Abstract P2-18-01: Single modality adjuvant therapy with radiation (RT) alone or endocrine therapy (ET) alone in women ≥65 years with early stage, hormone receptor positive breast cancer treated with breast-conserving surgery: A population-based analysis

Abstract Purpose: Current guidelines recommend for women (≥65 years at diagnosis) with early stage (T1N0), hormone receptor (HR+) breast cancer (BC) treated with breast-conserving surgery (BCS) that treatment with 5 years of endocrine therapy (ET) alone with omission of radiation (RT) is acceptable. Population studies however report that many women continue to receive RT. The use of RT may reflect preferences due to the …