Guleria S, et al. - Researchers intended to determine if there is an association between the use of fertility drugs and risk of breast cancer utilizing a nationwide cohort of Danish women. Between January 1, 1995, and December 31, 2011, women ages 20 to 44 years and living in Denmark were included. Of the 1,330,852 included women, 96,782 were infertile, and 20,567 were diagnosed with breast cancer during a 20.9-year median follow-up. Despite two decades of follow-up, there were no compelling links between the use of fertility drugs and breast cancer.