ERBB2 and breast cancer: This analysis compared normal tissue (n = 120/n = 75) with tissues from the following breast cancer subtypes: Basal-like (n = 168/n = 75), HER2-enriched (n = 78/n=24), Luminal-like A (n = 493/n = 89) and Luminal-like B (n = 194/n = 49).