GSTA1 and urinary bladder cancer: The most pronounced effect regarding occupational exposure to solvents and GST genotype on bladder cancer risk was observed for the GSTA1 genotype, since men exposed to solvents with GSTA1-low activity genotype had 9 times higher risk of bladder cancer than GSTA1-active unexposed men (95% CI = 2.4–34.7, p = 0.001).