Polymorphisms: GSTO1*A140D (C419A; rs4925), intron variant GSTO-1 (A/C; rs2282326)Main findings:- no significant associations between GSTO-1 polymorphisms and bladder cancer risk overall;- positive association between arsenic exposure and bladder cancer among subjects carrying the homozygous wild-type GSTO1*A140D. Here, GSTO1 is linked to urinary bladder carcinoma.