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Original Article
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Volume 334:1150-1155 May 2, 1996 Number 18
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Effects of a Combination of Beta Carotene and Vitamin A on Lung Cancer and Cardiovascular Disease
Gilbert S. Omenn, M.D., Ph.D., Gary E. Goodman, M.D., M.S., Mark D. Thornquist, Ph.D., John Balmes, M.D., Mark R. Cullen, M.D., Andrew Glass, M.D., James P. Keogh, M.D., Frank L. Meyskens, M.D., Barbara Valanis, Dr.P.H., James H. Williams, M.D., Scott Barnhart, M.D., M.P.H., and Samuel Hammar, M.D.

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ABSTRACT

Background Lung cancer and cardiovascular disease are major causes of death in the United States. It has been proposed that carotenoids and retinoids are agents that may prevent these disorders.

Methods We conducted a multicenter, randomized, double-blind, placebo-controlled primary prevention trial — the Beta-Carotene and Retinol Efficacy Trial — involving a total of 18,314 smokers, former smokers, and workers exposed to asbestos. The effects of a combination of 30 mg of beta carotene per day and 25,000 IU of retinol (vitamin A) in the form of retinyl palmitate per day on the primary end point, the incidence of lung cancer, were compared with those of placebo.

Results A total of 388 new cases of lung cancer were diagnosed during the 73,135 person-years of follow-up (mean length of follow-up, 4.0 years). The active-treatment group had a relative risk of lung cancer of 1.28 (95 percent confidence interval, 1.04 to 1.57; P = 0.02), as compared with the placebo group. There were no statistically significant differences in the risks of other types of cancer. In the active-treatment group, the relative risk of death from any cause was 1.17 (95 percent confidence interval, 1.03 to 1.33); of death from lung cancer, 1.46 (95 percent confidence interval, 1.07 to 2.00); and of death from cardiovascular disease, 1.26 (95 percent confidence interval, 0.99 to 1.61). On the basis of these findings, the randomized trial was stopped 21 months earlier than planned; follow-up will continue for another 5 years.

Conclusions After an average of four years of supplementation, the combination of beta carotene and vitamin A had no benefit and may have had an adverse effect on the incidence of lung cancer and on the risk of death from lung cancer, cardiovascular disease, and any cause in smokers and workers exposed to asbestos.


Source Information

From the Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle (G.S.O., G.E.G., M.D.T., S.B.); the Departments of Environmental Health and Medicine, University of Washington, Seattle (G.S.O., G.E.G., S.B., S.H.); the Swedish Hospital Tumor Institute, Seattle (G.E.G.); the Department of Medicine, University of California at San Francisco, San Francisco (J.B.); the Department of Medicine, Yale University, New Haven, Conn. (M.R.C.); Kaiser Permanente Center for Health Research, Portland, Oreg. (A.G., B.V.); the Department of Medicine, University of Maryland, Baltimore (J.P.K.); and the Department of Medicine and Cancer Center, University of California at Irvine, Orange (F.L.M., J.H.W.).

Address reprint requests to Dr. Omenn at the Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, 1124 Columbia–MP859, Seattle, WA 98104.

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Related Letters:

Antioxidant Vitamins, Cancer, and Cardiovascular Disease
Doering W., Pietrzik K., DeGrand D., Krinsky N. I., Peacocke M., Russell R. M., Hennekens C. H., Buring J. E., Peto R., Omenn G. S., Kushi L. H., Mink P. J., Folsom A. R., Greenberg E. R., Sporn M. B.
Extract | Full Text  
N Engl J Med 1996; 335:1065-1069, Oct 3, 1996. Correspondence

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