Routine shave margins are not necessary in early stage breast cancer treated with Breast Conserving Surgery

Abstract

IntroductionBreast Conserving Surgery (BCS) is considered standard of care for women with early stage breast cancer. Between 20 and 50% of women treated with BCS will require re-operation for positive or close margins and it has been suggested that routine cavity shave margins may reduce the frequency of positive margins. MethodsRetrospective chart review of a prospectively maintained surgical database of patients undergoing BCS for early stage breast cancer, at a single institution, between January 2012 and December 2015. Cohort was followed until June 2016 to capture re-operations. ResultsAmong 2096 patients with stage 0-III breast cancers, 872 (42%) underwent primary mastectomies and 1224 (58%) underwent primary BCS. Margins were positive in 128 (11%) and close in 442 (36%). Re-operation rate for patients after BCS was 19%. ConclusionA lower than predicted positive margin rate suggests that routine shave margins are not warranted at our institution.