| risk factors for epithelial ovarian cancer in beijing, china. | a study in beijing, china of 112 pathologically confirmed epithelial ovarian cancer cases and 224 age-matched community controls enabled evaluation of risk in relation to reproductive, medical, familial, and selected lifestyle factors. an inverse relationship was observed between the number of full-term pregnancies and ovarian cancer risk. compared to nulliparous women, subjects with one, two, or three full-term pregnancies were at 50%, 70%, or 90% reduced risks, respectively (p for trend less t ... | 1992 | 1544753 |