GSTP1 and breast cancer: Overall, this study is very informative: (a) GSTP1 is expressed in normal bladder tissues and in the majority of BC cases, showing a variation from intense to weak GSTP1 immunoreactivity; (b) the protein expression is not associated with disease’ stage or grade; (c) GSTP1 down‐expression found in some samples was not caused by gene promoter methylation.