Abstract
Purpose
Cyclooxygenase (COX) enzymes, COX1 and COX2, are key in converting arachidonic acid (AA) into prostaglandins that have been associated with colorectal carcinogenesis. The aim of our study was to investigate associations of polymorphisms in COX genes, alone and in interaction with exposures known to be related to inflammation and AA metabolism, with risk of colorectal adenomas.
Materials and methods
In a community-, colonoscopy-based case–control study with 162 incident, sporadic colorectal adenoma cases and 211 controls, we investigated associations of two promoter polymorphisms (−842 A > G in COX1 and −765 G > C in COX2) and two polymorphisms in the 3′-UTR of COX2 (8473 T > C and 9850 A > G) with risk of adenomas. Multiple logistic regression models were used to estimate odds ratios (OR) and 95% confidence intervals (CI) of colorectal adenoma after adjusting for potential confounders.
Results
Overall, there was no evidence for an association between any of the four polymorphisms and colorectal adenomas. However, we found a statistically significant interaction between the COX2 8473 T > C polymorphism and nonsteroidal anti-inflammatory drug (NSAIDs) use (P interaction = 0.03): The greatest reduced risk was observed for individuals with the 8473 C variant allele who also regularly used NSAIDs (OR = 0.35, 95% CI 0.16–0.75).
Conclusion
These results suggest that the C allele of COX2 8473 T > C polymorphism may interact with NSAIDs to reduce risk for colorectal adenoma.
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Acknowledgments
This study was supported by the Public Health Service grant R01CA-51932 from the National Cancer Institute, the National Center for Research Resources grant RR017698 from the National Institutes of Health, Department of Health and Human Services, the American Cancer Society Research Scholar grant RSG-06-122-01-CNE, and a Georgia Cancer Coalition Distinguished Scholar award (to R. Bostick), and National Cancer Institute, Center for Research and Cancer Health Disparities grant 1 U01 CA114601-01 (to JR Hebert).
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The authors declare that they have no conflict of interest.
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Gong, Z., Bostick, R.M., Xie, D. et al. Genetic polymorphisms in the cyclooxygenase-1 and cyclooxygenase-2 genes and risk of colorectal adenoma. Int J Colorectal Dis 24, 647–654 (2009). https://doi.org/10.1007/s00384-009-0656-8
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DOI: https://doi.org/10.1007/s00384-009-0656-8