Table 1. Pathological correlation of intrinsic subtypes in BC.

Molecular or intrinsic subtype	IHC expression
Luminal A	ER+, PR+, HER2−, Histological Grade (HG) 1-2, Ki-67 low
Luminal B	ER+, PR+/−, HER2+/−, HG 2–3, Ki-67 elevated
HER-2 enriched	ER−, PR−, HER2+
TN	ER−, PR−, HER2−