Microarray profiling of invasive breast carcinomas has identified five distinct subtypes of
tumors (luminal A, luminal B, normal breast-like, HER2 overexpressing, and basal-like) that
are associated with different clinical outcomes. The basal-like subtype is associated with
poor clinical outcomes and is the subtype observed in BRCA1-related breast cancers. The
aim of this study was to characterize the histologic and immunophenotypic properties of
breast basal-like carcinomas that were first positively identified using DNA microarray …