Original sentence: Even so, oophorectomy during hysterectomy is still frequently performed electively on women who have increased risk of certain reproductive system cancers, particularly breast cancer in conjunction with BRCA1 or BRCA2 mutation, where the adverse effects are balance out by the reduced breast cancer risk.However, recent studies have shown that prophylactic oophorectomy without an urgent medical indication decreases a woman's long-term survival rates substantially and has other serious adverse effects, particularly in terms of inducing early-onset-osteoporosis through removal of the major sources of female hormonal production.Oophorectomy (removal of ovaries) is frequently done together with hysterectomy to decrease the risk of ovarian cancer.This effect is not limited to pre-menopausal women; even women who have already entered menopause were shown to have experienced a decrease in long-term survivability post-oophorectomy
Edited sentence: Oophorectomy (removal of ovaries) was frequently done together with hysterectomy to decrease the risk of ovarian cancer, however it is now clear that prophylactic oophorectomy without an urgent medical indication decreases long-term survival rates substantially and has other serious adverse effects.This effect is not limited to premenopausal women, and a negative impact on survival is expected even for oophorectomy up to an age of 65 years