Postmenopausal women who took calcium channel blockers for more than 10 years were 2.5 times more likely to develop breast cancer than those who didn't take the antihypertensives, according to a study of nearly 3,000 women ages 55 to 74. Researchers looked at different types of blood pressure drugs and found that only calcium channel blockers were tied to higher breast cancer risk. The study, published in JAMA Internal Medicine, showed an association but not a causal link.

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