Polymorphisms: GSTO1*A140D (C419A; rs4925), GSTO1 polymorphism in 5′UTR gene region (G1242A; rs2164624), GSTO2*N142D (A424G; rs156697), GSTO2 polymorphism in 5′UTR gene region (A183G; rs2297235), and polymorphisms of other GSTs (GSTA2, GSTM2, GSTZ)Main findings: - no association between GSTO polymorphisms and breast cancer risk;- no association between GSTO polymorphisms and histopathological tumor characteristics. This evidence concerns the gene GSTO2 and breast carcinoma.