The most popular classification is the one based on molecular subtypes determined by gene expression profiling proposed by the expert panel at the St Gallen International Breast Cancer Conference in 2013 (1) and includes luminal A, luminal B, human epidermal growth factor receptor 2-positive (HER2+) overexpressing, and basal-like (BL) subtypes. This evidence concerns the gene ERBB2 and neoplasm.