The study, published online in the journal JAMA Oncology, is a long-term follow-up of the phase 1 clinical trial that led to the approval of the drug pembrolizumab by the U.S. Food & Drug Administration. The trial is the largest ever conducted in people with advanced melanoma, said Dr. Antoni Ribas, a professor of hematology and oncology, and director of the UCLA Jonsson Comprehensive Cancer Center Tumor Immunology Program.
"The early data from this research showed the unprecedented activity of pembrolizumab in people with advanced melanoma, and we can now report the full results of the study," Ribas said.
Pembrolizumab (marketed as Keytruda®) is a targeted therapy known as a checkpoint inhibitor. The drug is an antibody that blocks a protein called PD-1 that is expressed by immune cells. PD-1 puts the immune system's brakes on, keeping T cells from recognizing and attacking cancer cells. It releases the brakes from the body's immune system which allows it to attack the cancer cells.