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JNCI Journal of the National Cancer Institute 1996 88(21):1560-1570; doi:10.1093/jnci/88.21.1560
© 1996 by Oxford University Press
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Journal of the National Cancer Institute, Vol. 88, No. 21, 1560-1570, November 6, 1996
© 1996 Oxford University Press

{alpha}-Tocopherol and beta-Carotene Supplements and Lung Cancer Incidence in the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study: Effects of Base-line Characteristics and Study Compliance

Demetrius Albanes, Olli P. Heinonen, Philip R. Taylor, Jarmo Virtamo, Brenda K. Edwards, Matti Rautalahti, Anne M. Hartman, Juni Palmgren, Laurence S. Freedman, Jaason Haapakoski, Michael J. Barrett, Pirjo Pietinen, Nea Malila, Eero Tala, Kari Liippo, Eija-Riitta Salomaa, Joseph A. Tangrea, Lyly Teppo, Frederic B. Askin, Eero Taskinen, Yener Erozan, Peter Greenwald, Jussi K. Huttunen

Division of Cancer Prevention and Control, National Cancer Institute Bethesda, MD
Department of Public Health, University of Helsinki Finland
National Public Health Institute Helsinki, Finland
Information Management Services, Inc. Silver Spring, MD
Department of Diseases of the Chest, Turku University Hospital Finland
Finnish Cancer Registry Helsinki
Department of Pathology, The Johns Hopkins School of Medicine Baltimore, MD
University of Helsinki School of Medicine Baltimore. MD

Demetrius Albanes, M.D., National Institutes of Health, Executive Plaza North, Rm. 211, Bethesda. MD 20892-7326.

Background: Experimental and epidemiologic investigations suggest that {alpha}-tocopherol (the most prevalent chemical form of vitamin E found in vegetable oils, seeds, grains, nuts, and other foods) and beta-carotene (a plant pigment and major precursor of vitamin A found in many yellow, orange, and dark-green, leafy vegetables and some fruit) might reduce the risk of cancer, particularly lung cancer. The initial findings of the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study (ATBC Study) indicated, however, that lung cancer incidence was increased among participants who received beta-carotene as a supplement. Similar results were recently reported by the Beta-Carotene and Retinol Efficacy Trial (CARET), which tested a combination of beta-carotene and vitamin A. Purpose: We examined the effects of {alpha}-tocopherol and beta-carotene supplementation on the incidence of lung cancer across subgroups of participants in the ATBC Study defined by base-line characteristics (e.g., age, number of cigarettes smoked, dietary or serum vitamin status, and alcohol consumption), by study compliance, and in relation to clinical factors, such as disease stage and histologic type. Our primary purpose was to determine whether the pattern of intervention effects across subgroups could facilitate further interpretation of the main ATBC Study results and shed light on potential mechanisms of action and relevance to other populations. Methods: A total of 29 133 men aged 50–69 years who smoked five or more cigarettes daily were randomly assigned to receive {alpha}-tocopherol (50 mg), beta-carotene (20 mg), {alpha}-tocopherol and beta-carotene, or a placebo daily for 5–8 years (median, 6.1 years). Data regarding smoking and other risk factors for lung cancer and dietary factors were obtained at study entry, along with measurements of serum levels of {alpha}-tocopherol and beta-carotene. Incident cases of lung cancer (n = 894) were identified through the Finnish Cancer Registry and death certificates. Each lung cancer diagnosis was independently confirmed, and histology or cytology was available for 94% of the cases. Intervention effects were evaluated by use of survival analysis and proportional hazards models. All P values were derived from two-sided statistical tests. Results: No overall effect was observed for lung cancer from {alpha}-tocopherol supplementation (relative risk [RR] = 0.99; 95% confidence interval [CI] = 0.87–1.13; P =.86, logrank test). beta-Carotene supplementation was associated with increased lung cancer risk (RR = 1.16; 95% CI = 1.02–1.33; P =.02, logrank test). The beta-carotene effect appeared stronger, but not substantially different, in participants who smoked at least 20 cigarettes daily (RR = 1.25; 95% CI = 1.07–1.46) compared with those who smoked five to 19 cigarettes daily (RR = 0.97; 95% CI = 0.76–1.23) and in those with a higher alcohol intake (≥11 g of ethanol/day [just under one drink per day]; RR = 1.35; 95% CI = 1.01–1.81) compared with those with a lower intake (RR = 1.03; 95% CI = 0.85–1.24). Conclusions: Supplementation with {alpha}-tocopherol or beta-carotene does not prevent lung cancer in older men who smoke. beta-Carotene supplementation at pharmacologic levels may modestly increase lung cancer incidence in cigarette smokers, and this effect may be associated with heavier smoking and higher alcohol intake. Implications: While the most direct way to reduce lung cancer risk is not to smoke tobacco, smokers should avoid high-dose beta-carotene supplementation. [J Natl Cancer Inst 1996; 88: 1560–70]



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Online Perspectives about this Classic Article

{beta}-Carotene and Lung Cancer: A Lesson for Future Chemoprevention Investigations?
Peter Greenwald
J Natl Cancer Inst 2003 95: 1E. [Extract] [Full Text]

CORRESPONDENCE: Re: {beta}-Carotene and Lung Cancer: A Lesson for Future Chemoprevention Investigations?
Daniel O. Stram and Anna H. Wu
J Natl Cancer Inst 2003 95: 4E. [Extract] [Full Text]



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