More rare types were apocrine carcinoma (N = 2), metaplastic carcinoma (N = 2), mucinous carcinoma (N = 2), and papillary carcinoma (N = 1).There were many missing data from cases in the literature search, in 225 cases there was no information about HER2 status. The gene discussed is ERBB2; the disease is apocrine adenocarcinoma.