MCF-7, T-47D and ZR-75-1 are luminal breast cancer lines, SKBR-3 and MDA-MB-453 are ER− but express FOXA1 and AR and are representative of the mApo subtype, with ERBB2-amplification and high expression in SKBR-3 and MDA-MB-453, respectively. Here, ERBB2 is linked to breast carcinoma.