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More than 300,000 U.S. women carry BRCA mutations, with an attendant 5- to 20-fold increased risk for breast and ovarian cancer. Investigators developed a model to estimate survival probabilities among mutation carriers who undergo no intervention, breast screening with annual mammograms plus magnetic resonance imaging (MRI), prophylactic mastectomy (PM), prophylactic salpingo-oophorectomy (PO), or both surgeries.
Compared with no intervention, the single most effective intervention in BRCA1 carriers was PO at age 40, which led to a survival advantage (from 53% to 68%) by age 70. The combination of PO and PM at age 40 was the most effective overall strategy, resulting in survival gains at age 70 of 24% and 11% in BRCA1 and BRCA2 carriers, re…