ERBB2 and breast neoplasm: According to the 2019 WHO classification of breast tumors, basaloid differentiation within an otherwise NST carcinoma is no longer classified as separate entity, but is considered as a subset of NST carcinomas and is further classified into intrinsic groups based on ER/PR/Her2 expression such as luminal, TN, and Her2-positive subgroups [1, 7].