The February, 2009 issue of the American Association for Cancer Research journal Cancer Epidemiology, Biomarkers & Prevention published the discovery of researchers from the University of California, San Diego, the University of Arizona, and other research centers of a positive effect of high carotenoid intake on recurrence-free survival in breast cancer patients. Carotenoids, such as beta-carotene, occur in most fruits and vegetables. Diets high in these plant foods have been linked with a protective effect against various cancers in a number of studies.

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