Prostacyclin synthase and arachidonate 5-lipoxygenase polymorphisms and risk of colorectal polyps

Cancer Epidemiology, Biomarkers & Prevention : a Publication of the American Association for Cancer Research, Cosponsored by the American Society of Preventive Oncology
Elizabeth M PooleCornelia M Ulrich

Abstract

Prostacyclin synthase (PGIS) and arachidonate 5-lipoxygenase (ALOX5) are enzymes relevant to prostaglandin and leukotriene synthesis, both important pathways for colon cancer risk. We hypothesized that genetic variation altering the function of these enzymes would modify risk of colorectal polyps. In a Minnesota-based case-control study of adenomatous (n = 517) or hyperplastic (n = 192) polyps versus polyp-free controls (n = 618), we investigated the role of promoter repeat polymorphisms in PGIS and ALOX5 as well as ALOX5 -1700 G>A. Having fewer than six repeats on both PGIS alleles (<6R/<6R) was associated with an increased risk of adenomas compared with the 6R/6R (wild-type) genotype (OR, 1.90; 95% CI, 1.09-3.30). Having more repeats (>6R/> or =6R) reduced risk (OR, 0.73; 95% CI, 0.40-1.35; P(trend) = 0.03). In allele-based analyses, fewer repeats were associated with a modestly increased risk of adenomas and perhaps hyperplastic polyps. There were no risk differences for either the ALOX5 VNTR or -1700 G>A polymorphisms. Associations with regular use of aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs) differed by PGIS genotype. Among individuals with at least one wild-type allele, NSAID use was associated with a...Continue Reading

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Cancer Epidemiology, Biomarkers & Prevention : a Publication of the American Association for Cancer Research, Cosponsored by the American Society of Preventive Oncology
Cornelia M UlrichJeannette Bigler
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