Parity and Oral Contraceptive Use in Relation to Ovarian Cancer Risk in Older Women

Several studies have suggested that the ovarian cancer risk reductions associated with parity and oral contraceptive use are weaker in postmenopausal than premenopausal women, yet little is known about the persistence of these reductions as women age. This question gains importance with the increasing numbers of older women in the population.We addressed the question using data from three large U.S. cohort studies involving 310,290 white women...