American Journal of Epidemiology Vol. 153, No. 7 : 688-693
Copyright © 2001 by The Johns Hopkins University School of Hygiene and Public Health
ORIGINAL CONTRIBUTIONS |
Association of the B-Vitamins Pyridoxal 5'-Phosphate (B6), B12, and Folate with Lung Cancer Risk in Older Men
1 Department of Nutrition, The Pennsylvania State University, University Park, PA.
2 Division of Clinical Sciences, National Cancer Institute, Bethesda, MD.
3 National Public Health Institute, Helsinki, Finland.
4 US Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, MA.
5 Information Management Services, Silver Spring, MD.
A nested case-control study was conducted within the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study cohort to test for associations between selected B-vitamins (folate, vitamin B6, vitamin B12) and incident lung cancer. This trial was conducted in Finland between 1985 and 1993. Serum was analyzed for these nutrients and homocysteine among 300 lung cancer cases and matched controls (1:1). Odds ratios and 95% confidence intervals were determined in conditional and unconditional (controlling for the matching factors) logistic regression models, after adjusting for body mass index, years of smoking, and number of cigarettes smoked per day. No significant associations were seen between serum folate, vitamin B12, or homocysteine and lung cancer risk. The authors found significantly lower risk of lung cancer among men who had higher serum vitamin B6 levels. Compared with men with the lowest vitamin B6 concentration, men in the fifth quintile had about one half of the risk of lung cancer (odds ratio = 0.51; 95% confidence interval: 0.23, 0.93; p-trend = 0.02). Adjusting for any of the other serum factors (folate, B12, and homocysteine) either alone or jointly did not significantly alter these estimates. This is the first report from a prospectively conducted study to suggest a role for vitamin B6 in lung cancer.
folic acid; homocysteine; lung neoplasms; methylation; pyridoxine; vitamin B 12
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