New study finds that double mastectomies do not increase cancer survival rates for women with unilateral breast cancer. The research, published in JAMA Oncology, analyzed data from over 660,000 women and found no significant difference in overall death rates between those who underwent a double mastectomy and those who had only the affected breast or tumor removed.

Source: https://www.livescience.com/health/breast-cancer/double-mastectomies-don-t-increase-cancer-survival-study-suggests