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Cancer Prevention Research Program, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109 [J. B., J. W., J. W. L., J. D. P.]; Coordinating Centers for Biometric Research, Minneapolis, Minnesota 55414 [L. F.]; and South Carolina Cancer Center, University of South Carolina, Schools of Medicine and Public Health, Columbia, South Carolina 29203 [R. M. B.]
Regular use of nonsteroidal anti-inflammatory drugs (NSAIDs) has a protective effect on the incidence of colon neoplasia. However, polymorphisms in NSAID-metabolizing enzymes may alter this effect. NSAIDs, particularly aspirin, are glucuronidated by UGT1A6 and some classes of NSAIDs are also metabolized by cytochrome P450 (CYP) 2C9. Both of these enzymes have slow-metabolizing, variant forms. We tested the hypothesis that the slow alleles of these enzymes can modify the inverse association between NSAIDs and colon neoplasia in the Minnesota Cancer Prevention Research Unit (CPRU) adenomatous polyp case-control study. CYP2C9 and UGT1A6 genotypes were determined for 474 adenoma cases and 563 controls. NSAID use was inversely associated with adenoma risk [odds ratio (OR), 0.63; 95% confidence interval (CI), 0.44–0.90 for aspirin; and OR, 0.50; 95% CI, 0.31–0.82 for nonaspirin NSAID]. However, this association was absent in aspirin users who carried the CYP2C9 variant alleles (OR, 0.88; 95% CI, 0.51–1.53) or who were homozygous wild-type UGT1A6 (OR, 0.86; 95% CI, 0.50–1.50). Carriers of both of these alleles who use aspirin were also not at reduced risk of adenomatous polyps (OR, 1.59; 95% CI, 0.68–3.73). The variants of these enzymes did not influence the association between nonaspirin NSAIDs and adenoma risk. These data indicate that the effectiveness of chemopreventive drugs can be modulated by the genotype of metabolizing enzymes.
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