Often, I get asked by a patient if they should remove the breast without cancer. Removing the opposite breast without cancer is called a contralateral prophylactic mastectomy (CPM). Research has shown that only 3% to 5% of early breast cancer patients will develop cancer in the opposite breast over the next 10 years after developing breast cancer.  Removing the opposite breast offers no survival benefit and does not prevent metastatic disease from developing, except in a very small group of patients. A consensus group from the American Society of Breast Surgeons all agreed that removing the opposite (non-cancerous) breast should be discouraged for the average-risk woman. That being said, your doctor should discuss the benefits and risks of proceeding with removal of the contralateral breast while considering your preference. This is the importance of shared decision making. At the end of the day, you have to make the decision that ultimately you feel comfortable with.