I attended a talk on BC with 6 doctors, the most interesting fact I learned was that a double mastectomy, does NOT lower your risk for Breast cancer from coming back. Even in the most extreme procedures, they leave from 2 to 5% of breast tissue behind. After many studies they determined the chance of re-occurrence was the SAME with or without a mastectomy. So they are now trying to talk women out of this procedure. This was doctors with the University of Nebraska Medical Center.