After learning that she inherited a BRCA2 genetic mutation that put her at high risk for breast and ovarian cancer, Kim Horner's doctors urged her to consider having a double mastectomy. But how do you decide whether to have a surgery to remove your breasts to reduce your risk for a disease you don't have and may never get? Horner shares her struggle to answer that question in Probably Someday Cancer. The mother of a one-year-old boy, she wanted to...