ERBB2 and neoplasm: As to the adjacent non-tumor tissue, we found more significantly higher B3GALT5 mRNA levels in TNBC subtype than the other three subtypes (P = 0.002 vs HER-2-positive subtype; P = 0.024 vs luminal A subtype; P = 0.003 vs luminal B subtype) (Fig. 1b).