ERBB2 and triple-negative breast carcinoma: The principal subtypes include HER2 + (ER−/PR− and amplified for Her2), luminal A (ER + /PR + and HER2−), luminal B (ER + /PR + /HER2 + or HER2−), and triple-negative breast cancer (TNBC, ER−/PR−/HER2−).