Correct Answer: C. Estrogen-progestin contraceptives have been associated with a small increase in the risk of breast cancer, whereas the impact of progestin-only intrauterine devices (IUD) has been less clear. In an administrative database study, first-time levonorgestrel (LNG) IUD users (any dose) had a small increase in the overall risk of breast cancer compared with matched nonusers of hormonal contraception (hazard ratio 1.4), in line with some prior studies. To provide context and assist patients with assessing their own risk, we inform them that the breast cancer risk conferred by LNG IUDs appears to be modestly increased and similar to that of estrogen-progestin contraceptive pills. 
 

As you can see from the results above, it's a challenge to always identify the correct diagnosis. 
 

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