ERBB2 and breast carcinoma: Since MGP and TRPS1 showed high expression in luminal A/B, HER2-enriched, TNBC/basal-like, and normal-like subtypes according to the PAM50 subtyping (Fig. 3, Additional file 1: Figure S1), we selected MGP, TRPS1, and GATA3 for further validation in 1201 cases of breast carcinoma of different subtypes and normal breast tissues.