ERBB2 and breast carcinoma: A frequently used classification of breast carcinoma is based on the status of ER, PR, and HER2, and divides it into five subtypes: luminal A, luminal B HER2-positive, luminal B HER2-negative, HER2-positive (non-luminal), and triple-negative, each with its own diagnostic method, treatment, and different prognosis [11].