I.V.F. Does Not Raise Breast Cancer Risk, Study Shows
Women undergoing in vitro fertilization have long worried that the procedure could raise their risk for breast cancer. After all, the treatment requires temporarily increasing levels of certain sex hormones to five or 10 times the normal. Two of those hormones, estrogen and progesterone, can affect the course of certain kinds of breast cancer. A series of studies over the past decade suggested that these former patients may have little to worry about.