XRCC1 and urinary bladder cancer: Seven meta-analyses discussed the association between polymorphisms of XRCC1 Arg399Gln and bladder cancer in Asian populations and reported that the OR (95%CI) of bladder cancer for the Arg/Arg + Arg/Gln genotype versus the Gln/Gln genotype was 1.14 (0.88–1.48) [20]; for the Arg/Gln genotype versus the Gln/Gln + Arg/Arg genotype, 1.14 (0.98–1.33) [37]; for the Arg/Arg genotype versus the Gln/Gln + Gln/Arg genotype, 0.78 (0.43–1.41) for the entire Asian population and 0.68 (0.52–0.90) for smokers [19]; and the Gln/Gln genotype versus the Arg/Gln + Arg/Arg genotype, 0.65 (0.49–0.86) [38].