According to the immunohistochemical analysis, there were 19 cases (27.94%) of Luminal A type breast cancer, 28 cases (41.18%) of Luminal B type breast cancer, 9 cases (13.24%) of HER2 overexpression type, and 7 cases (10.29%) of triple-negative breast cancer. The gene discussed is ERBB2; the disease is triple-negative breast carcinoma.