ERBB2 and breast cancer: We verified the significantly high expression of DJ-1 in HR+ breast cancer cells (MCF-7 and T-47D) compared to nontumorigenic breast epithelial cell line (MCF-10A), HER2+ breast cancer cells (SK-BR-3 and BT-474) or TNBC cells (MDA-MB-231 and MDA-MB-468) in mRNA and protein level via qRT-PCR and western blot assay (Figures 2(c) and 2(d)).