After more than two decades of public awareness about the benefits of lumpectomy and radiation for most breast cancer, women continue to get double mastectomies, even when they only have cancer in one breast.  Here’s a large study that followed a trend that continues today. http://journals.lww.com/annalsofsurgery/Abstract/publishahead/Growing_Use_of_Contralateral_Prophylactic.97018.aspx