BrCa classification is based on histological and molecular features that distinguish luminal A, luminal B, HER2/neu, and basal-like subtypes, which are generally paired with the expression status of the receptors for estrogen (ER), progesterone (PR), and human epidermal growth factor 2 (HER2) [3]. The gene discussed is ERBB2; the disease is invasive breast carcinoma.