Combined effect of genetic polymorphisms in phase I and II biotransformation enzymes on head and neck cancer risk

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Background.Combinations of genetic polymorphisms in biotransformation enzymes might modify the individual risk for head and neck cancer.Methods.Blood from 432 patients with head and neck cancer and 437 controls was investigated for genetic polymorphisms in 9 different phase I and II biotransformation enzymes. Analysis of the risk-modifying effect was performed according to predicted enzyme activities, based on genetic polymorphisms in the corresponding genes.Results.Combination of polymorphisms inCOX-2orEPHX1with high activity polymorphisms inUGT1A1,UGT1A6, orUGT1A7showed a risk-modulating effect in head and neck carcinogenesis, especially among heavy smokers and patients with laryngeal cancer. However, no additional effect for the combination of these polymorphisms was discovered when compared to the impact of polymorphism inUGT1A1,UGT1A6, andUGT1A7individually.Conclusion.Predicted high activity polymorphisms in the phase II enzymes UGT1A1, UGT1A6, and UGT1A7 are associated with an increased risk of head and neck cancer. Head Neck, 2012

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