This research study used an appropriate research design. However, it is a retrospective study, which makes it a little weaker. While the experiments do answer the questions the researchers are asking, the results are very generalized. Mastectomy should be an individualized decision between the patient and the health care provider.
Additionally, while they do see an increase in the rate of double mastectomy in men (the rate doubled), the absolute increase is relatively small because double mastectomy is relatively rare in men. This study is relevant to male young breast cancer survivors, who had the highest rates of double mastectomy. Researchers were not able to look at BRCA status, which may have influenced double mastectomy rates.