A Prospective Study of the Intake of Vitamins C, E, and A and the Risk of Breast Cancer

David J. Hunter, Joann E. Manson, Graham A. Colditz, Meir J. Stampfer, Bernard Rosner, Charles H. Hennekens, Frank E. Speizer, Walter C. Willett

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Abstract

Background: Although it has been hypothesized that large intakes of the antioxidant vitamins C, E, and A reduce the risk of breast cancer, few prospective data are available. Methods: We prospectively studied 89,494 women who were 34 to 59 years old in 1980 and who did not have diagnosed cancer. Their intakes of vitamins C, E, and A from foods and supplements were assessed at base line and in 1984 with the use of a validated semiquantitative food-frequency questionnaire. Results: Breast cancer was diagnosed in 1439 women during eight years of follow-up. After multivariate adjustment for known risk factors, the relative risk among women in the highest quintile group for intake of vitamin C as compared with the risk among those in the lowest quintile group was 1.03 (95 percent confidence interval, 0.87 to 1.21); for vitamin E, after vitamin A intake had been controlled for, the relative risk was 0.99 (95 percent confidence interval, 0.83 to 1.19). In contrast, among women in the highest quintile group for intake of total vitamin A the relative risk was 0.84 (95 percent confidence interval, 0.71 to 0.98; P for trend = 0.001). Among women in the lowest quintile group for intake of vitamin A from food, consumption of vitamin A from supplements was associated with a reduced risk (P = 0.03). The significant inverse association of vitamin A intake with the risk of breast cancer was also found on study of data based on the 1984 questionnaire and four years of follow-up. Conclusions: Large intakes of vitamin C or E did not protect women in our study from breast cancer. A low intake of vitamin A may increase the risk of this disease; any benefit of vitamin A supplements may be limited to women with diets low in vitamin A., Rates of breast cancer vary more than fivefold among countries,1 suggesting that there are potentially modifiable environmental determinants2. Dietary fat has been thought to increase the risk of breast cancer3; however, in prospective studies we and others49 have observed no evidence or only weak evidence of a positive association. Vitamins C and E and the carotenoids, which all have antioxidant properties, and vitamin A, a regulator of cell differentiation, have been hypothesized to reduce the risk of the disease. Vitamin C has been postulated to decrease the risk of cancer in general10 and breast cancer in particular…

Original languageEnglish
Pages (from-to)234-240
Number of pages7
JournalNew England Journal of Medicine
Volume329
Issue number4
DOIs
StatePublished - Jul 22 1993
Externally publishedYes

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    Hunter, D. J., Manson, J. E., Colditz, G. A., Stampfer, M. J., Rosner, B., Hennekens, C. H., Speizer, F. E., & Willett, W. C. (1993). A Prospective Study of the Intake of Vitamins C, E, and A and the Risk of Breast Cancer. New England Journal of Medicine, 329(4), 234-240. https://doi.org/10.1056/NEJM199307223290403