Classically, breast cancer can be divided into three subtypes, including estrogen receptor (ERα) positive w/o progesterone receptor (PR) positive luminal subtype, human epidermal growth factor receptor 2 (HER2) positive HER2 subtype, and ER-/PR-/HER2- triple-negative subtype (TNBC). Here, ERBB2 is linked to breast carcinoma.