Cohort study: Diabetes, metformin, and breast cancer incidence among postmenopausal women

Cohort study: Diabetes, metformin, and breast cancer incidence among postmenopausal women

Source: JCO

There is emerging evidence suggesting that metformin may reduce breast cancer incidence, but reports are mixed and few provide information on tumour characteristics. This study used data from the Women’s Health Initiative (WHI) clinical trials to examine relationships among diabetes, metformin use, and breast cancer in postmenopausal women.   The WHI clinical trials program involves more than 68,019 postmenopausal women who were observed prospectively; 11,290 had diabetes at study entry or developed it during follow-up, and 3,273 developed invasive breast cancer after study entry.   The researchers found that compared with that in women without diabetes, breast cancer incidence in women with diabetes differed by diabetes medication type (P = 0.04). Women with diabetes receiving medications other than metformin had a slightly higher but not statistically significant incidence of breast cancer (hazard ratio [HR], 1.16; 95% CI, 0.93 to 1.45), and women with …

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