IHC staining was additionally used to assess STEAP3 protein levels in Normal vs TNBC, Normal vs non-TNBC and TNBC vs non-TNBC, revealing significantly increased STEAP3 expression in 23 TNBC tumor tissue samples relative to matched paracancerous samples but no increase STEAP3 expression was observed in the non-TNBC and its control group. This evidence concerns the gene STEAP3 and neoplasm.