ERBB2 and cancer: To examine PGRMC1 expression in cancers compared with normal breast tissue, TCGA data were analyzed based on tumor IHC classification for 738 ER+, 215 ER−, 643 PR+, 307 PR−, 149 HER2+, 508 HER2−, and 102 TNBC tumors and 108 normal controls.