Nowadays, besides the surgical and the radiotherapy approach, the pharmacological treatment of breast cancer involves trastuzumab (in case of HER2 positivity), endocrine therapies such as tamoxifen or cytotoxic drugs such as anthracycline, cyclophosphamide, epirubicin and docetaxel, paclitaxel, and carboplatin [43]. The gene discussed is ERBB2; the disease is breast carcinoma.