ERBB2 and breast cancer: Overall, 53.2% of patients had the Luminal A molecular subtype (LABC) (141/265), 18.5% had Luminal B (LBBC) (49/265), 18.5% had triple negative (TNBC) (49/265) and 9.8% had HER2 overexpressing (HER2 +) breast cancers (26/265).