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Prophylactic oophorectomy: Preventing cancer by surgically removing your ovaries

Doesn't mastectomy offer a greater reduction in breast cancer risk?

Yes. Surgery to remove your breasts (bilateral mastectomy) may reduce your risk of breast cancer by 90 percent. As an example, if your risk of developing breast cancer at some point in your lifetime is 50 percent, a preventive mastectomy may lower your risk to 5 percent.

Put another way, for every 100 women with that same level of risk who undergo preventive mastectomy, five could be diagnosed with breast cancer at some point in their lives.