GSTP1 and colorectal cancer: For example, GSTP1 overexpression is a marker of cell proliferation in a variety of tumors, such as transitional cell carcinoma of the bladder [22, 23], renal epithelial renal cell carcinoma [24, 25], ovarian cancer [26, 27], breast cancer [28, 29], and colorectal cancer [30, 31].