Overexpression of NQO1 mRNA and protein in breast cancer tissues. Expression of NQO1 mRNA and protein in breast cancers tissues (T) and adjacent non-tumor tissues (ANT) were examined by qPCR (A) and western blotting (B). Data in (A) represent fold change of relative NQO1 mRNA expression normalized to GAPDH levels. Error bars represent the standard deviation of the mean (SD) calculated from three parallel experiments. *P < 0.05.