Calcium channel blockers linked to breast cancer

Women who took these medications had a 2.4 to 2.6-fold higher risk of breast cancer than women who did not take anti-hypertensives, according to the research published in the Journal of the American Medical Association (JAMA). 

"Other antihypertensive medications – diuretics, beta-blockers and angiotensin II antagonists – were not associated with increased breast cancer risk," the authors said.

The study was observational and did not examine the possible mechanism for the increased risk, but experts said the findings could have major public health implications.

"While some studies have suggested a positive association between calcium channel blocker use and breast cancer risk, this is the first study to observe that long-term current use of calcium channel blockers in particular is associated with breast cancer risk," the authors wrote.

Researchers examined breast cancer risk using a population of women aged 55 to 74 in