Abstract
Introduction
The inducible Cyclooxygenase (COX)-2 enzyme plays an important role in inflammation and carcinogenesis. Recent reports suggest that single nucleotide polymorphisms (SNPs) in the COX-2 gene may alter enzyme function and in turn modify an individual’s risk of colon cancer. We explored the association between the COX-2 Val511Ala SNP and risk of colon cancer among 240 African American cases and 326 African American controls in a population-based, case-control study in North Carolina.
Methods
We used unconditional logistic regression models to determine the odds ratios (ORs) for genotype and risk of colon cancer.
Results
We observed a non-statistically significant inverse association between any Ala COX-2 genotype and risk of colon cancer (OR = 0.62, 95% CI: 0.33, 1.16) among African Americans. The inverse association was present among non-regular NSAID users, use ≤ 3 times/week, (OR = 0.66; 95% CI: 0.32, 1.37) and regular NSAID users, use ≥3 times/week for ≥3 months, (OR = 0.41; 95% CI: 0.11, 1.54).
Conclusions
Our results suggest that the COX-2 Val511Ala SNP does not antagonize the effect of NSAIDs on colon cancer risk and provides support that NSAID use and the COX-2 Val511Ala SNP may contribute to a reduced risk of colon cancer among African Americans.
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Abbreviations
- COX:
-
cyclooxygenase
- PTGS:
-
prostaglandin H synthase
- CI:
-
confidence interval
- NCCCS:
-
North Carolina Colon Cancer Study
- NSAID:
-
nonsteroidal anti-inflammatory drugs
- OR:
-
odds ratio
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Acknowledgements
Funding supported by the Population Sciences Research Award from the UNC Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, the Lineberger Comprehensive Cancer Center Core Grant (P30-CA16086), the Center for Environmental Health and Susceptibility (NIEHS P30-ES10126), and the National Institutes of Health (R01-CA66635). These analyses were conducted while Dr. Sansbury was a National Institutes of Health predoctoral trainee (T32-CA09330) at the University of North Carolina at Chapel Hill.
Conflict of interest: Dr. Sandler has received grant support and serves as a consultant to Merck.
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Sansbury, L.B., Millikan, R.C., Schroeder, J.C. et al. COX-2 Polymorphism, Use of Nonsteroidal Anti-Inflammatory Drugs, and Risk of Colon Cancer in African Americans (United States). Cancer Causes Control 17, 257–266 (2006). https://doi.org/10.1007/s10552-005-0417-0
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DOI: https://doi.org/10.1007/s10552-005-0417-0