Long-term Statin Use And Risk Of Ductal And Lobular Breast Cancer Among Women 55-74 Years Of Age, Cancer Epidemiology, Biomarkers & Prevention, September 2013
Why? They don’t know:
The biology underlying an association between statin use and breast cancer risk is uncertain.
We observed that risks were highest among long-term current users suggesting that statins may act as promoters of breast carcinogenesis.
What about short term use?
This finding does not rule out the possibility that shorter term statin use may have no effect … on the development of breast cancer.
It’s probably not because the women had high cholesterol to begin with:
Our finding of a greater than 2-fold increased risk of breast cancer among current long-term statin users in analyses restricted to study participants reporting a history of high cholesterol is evidence that confounding by indication does not account for the excess of breast cancer cases among statin users.
If this association holds up, it’s a ticking time bomb:
Approximately a quarter of all United States women over the age of 45 report current use of one of the seven different statin drugs on the market today.