In comparison to our findings, several studies have reported an upregulated GSTP1 expression which increased gradually with high‐grade tumor or invasive‐stage and was linked to decreased levels of urothelial cells apoptosis (Chen et al., 2013; Pljesa‐Ercegovac et al., 2011; Savic‐Radojevic et al., 2007). Here, GSTP1 is linked to neoplasm.