Study Question: Do fertility drugs increase the risk of thyroid cancer among infertile women?
Summary Answer: The use of most types of fertility drugs was not associated with an increased risk of thyroid cancer.
What Is Known Already: The incidence of thyroid cancer is higher for women than men, especially during reproductive years, indicating that reproductive hormones may be involved in the development of thyroid cancer. Only a few previous studies have examined the association between the use of fertility drugs and incidence of thyroid cancer and the results are inconclusive.