Clinical studies have shown that prophylactic bilateral mammectomy or bilateral oophorectomy can reduce 50%–90% of the risk of breast and ovarian cancer in women who have family history of breast cancer and carry BRCA1/2 mutations (Domchek & Kaunitz, 2016; Rizvi, Truong, & Truong, 2017). Here, BRCA1 is linked to breast cancer.