21-gene recurrence score assay (RS) and impact on adjuvant chemotherapy (CTx) use among lobular (L) and ductal (D) histology hormone receptor positive (HR+) early breast cancers (EBC).

Abstract

543 Background: RS identifies lower risk HR+ EBCs that may avoid adjuvant CTx. L histology may influence CTx use in intermediate RS cancers given its association with high HR+ expression and hormon...