Mirena IUD的例子：
FDA Conclusion
A comprehensive investigation by the Food and Drug Administration found that it is unlikely that the Mirena IUD could increase a person's cancer risk. It does not contain any drugs, hormones or compounds known to contribute to the formation or growth of cancerous cells. On the other hand, birth control methods containing estrogen have been theoretically implicated as a potential contributing factor to some cancers.
Reasons for Low Risk
The Mirena IUD contains very low levels of reproductive hormones, because it sits directly inside the uterus, where miniscule amounts of progestin perform the same functional effect as a systemic birth control pill. It does not contain any estrogen and fairly low amounts are absorbed into the bloodstream. There are no known or suspected carcinogens in the other materials found inside a Mirena IUD, so it is very unlikely that it could cause cancer.
Cancer-Preventing Benefits?
A review by the International Agency for Research on Cancer, or IARC, suggested that birth control containing only progestin may decrease the risk of endometrial cancer-- a form of cancerous growth occurring in the lining of the uterus. In theory, it could also decrease the risk of ovarian or uterine cancers, but more studies need to take place to confirm these results.
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