R., Taylor K.M., Snyder K., P.R., Virtamo J., Albanes D. Manganese superoxide dismutase polymorphism, alpha-tocopherol supplementation and prostate cancer risk in the alpha-tocopherol, beta-carotene cancer prevention study (Finland). Cancer Causes Control. Ichimura Y., Habuchi T., Tsuchiya N., Wang L., Oyama C., Sato K., Nishiyama H., Ogawa O., Kato T. Increased risk of bladder cancer associated with a glutathione peroxidase 1 codon 198 variant. J