Former President Jimmy Carter was given a new breakthrough treatment Pembrolizumab. Pembrolizumab is sold under the brand name Keytruda and was developed by Merck & Co., Inc. in the United States. In September 2014 it was one of the first immunotherapy drugs approved by the Food and Drug Administration (FDA). Instead of killing cancer cells, immunotherapy drugs are designed to boost the body's immune system to fight cancer. Pembrolizumab is a monoclonal antibody. Recent studies involving Pembrolizumab have shown the drug has increased overall survival of melanoma patients. Although the long term outlook is still unknown, it is only thought to extend survival in patients and not necessarily be a cure.