Researchers have studied how the amount or type of hormones in oral contraceptives affects ovarian cancer risk. One study, the Cancer and Steroid Hormone (CASH) study, found that the reduction in ovarian cancer risk was the same regardless of the type or amount of estrogen or progestin in the pill (5). A more recent analysis of data from the CASH study, however, indicated that oral contraceptive formulations with high levels of progestin were associated with a lower risk of ovarian cancer than formulations with low progestin levels (6). In another study, the Steroid Hormones and Reproductions (SHARE) Study, researchers investigated new, lower-dose progestins that have varying androgenic (testosterone-like) effects. They found no difference in ovarian cancer risk between androgenic and nonandrogenic pills (7).