ERBB2 and breast carcinoma: Using these markers, IBC can be classified into molecular-like breast cancer subtypes: hormone receptor-positive tumors, which include Luminal A-like and Luminal B-like (either HER2-negative or HER2-positive), HER2-positive tumors (HER2+, non-luminal), and triple-negative breast cancer (TNBC) [4,5].