Louise Brinton,PhD, Chief of the Hormonal and Reproductive Epidemiology branch at the National Cancer Institute, studied the long-term effects of endometriosis in Sweden starting about 20 years ago. Using the country's national inpatient register, she identified more than 20,000 women who had been hospitalized for endometriosis. After an average follow-up of more than 11 years, the risk for cancer among these women was elevated by 90% for ovarian cancer, 40% for hematopoietic cancer (primarily non-Hodgkin's lymphoma), and 30% for breast cancer. Having a longer history of endometriosis and being diagnosed at a young age were both associated with increased ovarian cancer risk.
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