The study focussed on women who were on fertility drugs and failed to conceive a 10 plus week pregnancy as opposed to those who were not on the drugs
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From the article"The researchers state: Our data suggest that exposure to a stimulated pregnancy is enough to undo the reduction in risk associated with a history of exposure to ovulation-stimulating drugs.
According to the researchers, fertility drugs potentially elevate the risk by a change in pregnancy-related breast-tissue remodeling, although the risk of breast cancer in successfully treated women was comparable to that of non-users.
The researchers are aware that their study had some limitations, for example, the reliance on self-reported fertility drug usage as well as lack of data on specific diagnosis for infertility."
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