Surprisingly, at 1% FDR, we found only six differentially expressed proteins (ACOT7, BDH2, DSCC7, HSP90AB1, LMNA, MYOF) between Luminal A which is a HER2 negative BC subtype, and Luminal B which can be either HER2 negative or occasionally HER2 positive43. This evidence concerns the gene HSP90AB1 and breast cancer.