Breast cancer is treated using various therapies, including surgery [2], radiotherapy [3], endocrine therapy for patients with estrogen receptor positive (ER +) breast cancer [4], and targeted therapy, such as monoclonal antibody trastuzumab targeting HER-2 [5], and chemotherapy which is an important strategy for patients diagnosed with advanced stage cancer [6]. The gene discussed is ERBB2; the disease is breast carcinoma.