ERBB2 and neoplasm: The ROR score takes into consideration the correlation to four of the five molecular intrinsic subtypes: basal-like, HER2-enriched, luminal A, and luminal B. The fifth subtype—the normal-like—is characterized by low expression of proliferation-associated genes, along with a gene expression pattern reminiscent of normal epithelial cells [6,9]; it is still unclear as to what extent this represents a real tumor subtype, or merely the degree of infiltrating non-tumor cells.