© 1995 by Oxford University Press
Journal of the National Cancer Institute, Vol. 87, No. 4, 274-279,
February 15, 1995
© 1995 Oxford University Press
Cigarette Smoking and Alcohol Consumption as Risk Factors for Colorectal Adenomatous Polyps
1The University of Texas-Houston Health Science Center, School of Public Health Houston
2Division of Cancer Prevention, The University of Texas M. D. Anderson Cancer Center Houston
Correspondence to: R. Sue McPherson, Ph.D., Human Nutrition Center, The University of Texas-Houston School of Public Health, P.O. Box 20186, Houston, TX 77225.
Background: Results of epidemiologic studies suggest that there is limited evidence for the association between cigarette smoking and risk of colorectal cancer. Cigarette smoking has been shown to increase the risk of colorectal adenomatous polyps, which are recognized as precursors of colorectal cancer, while few studies have examined the association between alcohol consumption and the development of adenomatous polyps. Purpose: We examined the association between cigarette smoking, alcohol consumption, and the presence of colorectal adenomatous polyps. Methods: Analyses were based on data from a case-control study of dietary and other lifestyle factors for colorectal adenomatous polyps. We assessed the risk of adenomatous polyps associated with total number of years of smoking, number of cigarettes smoked per day, and pack-years of smoking for past and current smokers separately. We also assessed the joint association between cigarette smoking and alcohol consumption on the risk of adenomatous polyps. Results: Current smokers who smoked more than 20 pack-years were at significantly higher risk of adenomatous polyps compared with never smokers (odds ratio [OR] = 2.56; 95% confidence interval [CI] = 1.28–5.14). Past smokers also had an increased risk of having adenomatous polyps, but no clear trend was observed for pack-years of smoking. Alcohol consumption was positively associated with risk of adenomatous polyps. Compared with nondrinkers, the strongest risk was observed for individuals who consumed 2.31–9.46 g alcohol per day (OR = 2.23; 95% CI = 1.29–3.83), and a decrease in risk was observed for individuals who consumed 9.47–67.36 g alcohol per day (OR = 1.63; 95% CI = 0.92–2.88). Among current smokers, a joint effect was observed for individuals who smoked and drank compared with those who never smoked and were not current drinkers (OR = 4.21; 95% CI = 1.88–9.41). For past smokers, a significant joint effect of smoking and current alcohol consumption was also observed, but the risk was not as strong as that for current smokers (OR = 2.61; 95% CI = 1.40–4.87). Conclusions: These data provide further evidence of the positive association between cigarette smoking and the development of colorectal adenomatous polyps. The combination of cigarette smoking and alcohol consumption increased the risk of adenomatous polyps. Implications: Future research should focus on the understanding of the role of cigarette smoking and alcohol consumption as these two factors relate to the evolution of colorectal adenomatous polyps and subsequent carcinogenesis. [J Natl Cancer Inst 87: 274-279, 1995]
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