Journal
CARCINOGENESIS
Volume 22, Issue 5, Pages 827-829Publisher
OXFORD UNIV PRESS
DOI: 10.1093/carcin/22.5.827
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Superoxide dismutases play a key role in the detoxification of superoxide radicals and thus protect cells from damage induced by free radicals. Within mitochondria manganese superoxide dismutase (MnSOD) provides a major defence against oxidative damage by reactive oxygen species. Polymorphism in the mitochondrial targeting sequence of MnSOD has recently been associated with risk of breast cancer. We examined this in a study population consisting of 483 breast cancer cases and 482 controls, all of Finnish Caucasian origin, Odds ratios (OR) and 95% confidence intervals (95% CIs) were estimated by unconditional logistic regression. MnSOD genotypes containing the variant A allele were found to be associated with a 1.5-fold (95% CI 1.1-2.0) increased risk of breast cancer compared with those with the homozygous wild-type genotype (MnSOD VV). This finding supports the proposal that MnSOD genotypes may modify individual breast cancer risk.
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