ERBB2 and breast cancer: The group of BC patients was divided into the following biological subtypes: n = 11 patients with the luminal A (LA) subtype, n = 10 patients with the luminal B HER2 negative (LB-) subtype, n = 7 patients with the luminal B HER2 positive (LB+) subtype, n = 6 patients with the HER2 positive (HER2+) subtype and n = 8 patients with the triple negative breast cancer (TNBC) subtype.