GSTO2 and breast cancer: Polymorphisms: GSTO1*A140D (C419A; rs4925), GSTO2*N142D (A424G; rs156697)Main findings:- increased risk of breast cancer in subjects with A allele of GSTO1*A140D (C419A; rs4925) and G allele of GSTO2*N142D (A424G; rs156697);- increased risk of breast cancer in subjects with CA+AA genotype for GSTO1-1 and GG genotype for GSTO2-2.