Journal
ONCOLOGIST
Volume 16, Issue 6, Pages 726-729Publisher
ALPHAMED PRESS
DOI: 10.1634/theoncologist.2011-0050
Keywords
Breast cancer; Diabetes; Overweight; Risk
Categories
Funding
- Associazione Italiana per la Ricerca sul Cancro (AIRC)
- American Cancer Society
- Cancer Prevention Research Institute of Texas
- NIH/NCI
- Novartis
- Susan G. Komen for the Cure
- Bruce Chabner
- U.S. Government
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We considered epidemiological data on overweight, diabetes, insulin, and breast cancer. Overweight is inversely related to premenopausal breast cancer, but there is definite evidence that, as compared with normal weight women, the relative risk (RR) for postmenopausal breast cancer is around 1.5 for overweight women and > 2 for obese women, and that the association is stronger in elderly women. Overweight and obesity are strongly related to diabetes. Diabetes is associated with postmenopausal breast cancer, too, with summary RRs from meta-analyses of 1.15-1.20, but not with premenopausal breast cancer (RR, 0.9). There is no consistent evidence that fasting insulin is related to breast cancer risk. Thus, although overweight and obesity are strongly related to postmenopausal breast cancer, diabetes is only moderately related to it. Given the extent of the association, and the likely residual confounding by overweight, inference on causality for the diabetes-breast cancer relation remains open to discussion. The Oncologist 2011;16:726-729
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