A new Danish study found that the use of hormonal intrauterine devices (IUDs) is associated with a slightly higher risk of breast cancer in women aged 15 to 49. The research indicates that women using hormonal IUD contraceptives have a 40 percent higher chance of developing breast cancer compared to nonusers.
This increase sounds high, but breast cancer is still rare in younger women. For perspective, this 40 percent higher chance means about 14 extra cases of breast cancer per 10,000 women using hormonal IUDs, on top of the baseline risk for this age group.
