The breast cancer molecular subtypes studied here spanned luminal A (T47-D, MCF7, ZR-75–1), human epidermal growth factor receptor 2 (HER2)+ (SKBR3), triple-negative A (MDA-MB-468, HCC-1937), and triple-negative B (MDA-MB-231, Hs578T). Here, ERBB2 is linked to breast cancer.