Microsomal epoxide hydrolase polymorphism as a risk factor for ovarian cancer

Molecular Carcinogenesis
J M LancasterJ A Taylor

Abstract

Microsomal epoxide hydrolase (EPHX) is one of many enzymes involved in the metabolism of endogenous and exogenous toxicants. Polymorphic forms of the human EPHX gene have been described that vary in enzymatic activity, and one, Tyr113His, has been associated with hepatocellular carcinoma susceptibility. We demonstrated that EPHX was highly expressed in the human ovary, and investigated whether specific EPHX genotypes are associated with ovarian cancer susceptibility. Seventy-three Caucasian patients with ovarian cancer and 75 Caucasian-female controls without cancer were genotyped for the Tyr113His polymorphism by a polymerase chain reaction-restriction fragment length polymorphism assay. The frequency of the homozygous high-activity genotype was 41% in the control population and 64% in the ovarian cancer patients. The odds ratio for ovarian cancer with this genotype was 2.6 (95% confidence interval 1.3, 5.0; P < 0.01). The increased ovarian cancer risk associated with the high-activity genotype could reflect differences in metabolic activation of endogenous or exogenous carcinogens.

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