Skip to main content

Table 1 Intrinsic classification of breast cancer by gene expression profiles and cell surface hormonal expression

From: DNA methylation signatures for breast cancer classification and prognosis

ER-positive ER-low ER-negative, PR-negative, HER2-negative Normal breast-like
Luminal A HER2-enriched Claudin-low High stromal content
Luminal B   Basal-like subtype High lymphocyte infiltration
    True normal epithelial cell contamination
  1. Column headings indicate primary immunohistochemical criteria only (ER-positive and so on; in italics). The subtypes are indicated below each heading. Subtypes in bold exhibit worse prognosis (relapse and mortality). There are four most commonly referred subtypes in the literature: luminal A, luminal B, HER2-enriched and triple-negative basal-like. Additional subtypes that have been proposed are claudin-low in the triple-negative group and normal breast-like, which are subdivided into additional subtypes. Subtypes in bold show significantly poorer outcome than luminal A subtypes. ER, estrogen receptor; HER2, human epidermal growth factor receptor 2; PR, progesterone receptor.