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Breast tumor subtypes defined by expression of estrogen receptor (ER), progesterone receptor (PR), HER2, cytokeratins 5 or 5/6 (CK5 or CK5/6), and epidermal growth factor receptor (EGFR) in 34 studies participating in the Breast Cancer Association Consortium. The number of case patients for each tumor subtype was pooled across all studies with data on the particular subtype.
