"While breast cancer and ovarian cancer were less frequent in women who had their ovaries removed, the overall risk of death from all types of cancer was higher among women who had their ovaries removed. When we considered just the women who never used estrogen therapy after surgery, we found that women who had removal of their ovaries had a higher risk of stroke and lung cancer, and women who had removal of their ovaries before age 50 had a higher risk of heart disease, stroke and death from any cause. " Although this site isn't identified as to source, it seems to be wholly devoted to this one study and medically sound in the information it presents