UCLA Jonsson Comprehensive Cancer Center member Dr. Antoni Ribas has received a National Cancer Institute (NCI) Outstanding Investigator Award of $4.2 million in recognition of his groundbreaking research developing new immunotherapies that utilize the human body's own natural defenses to fight cancer.

The award supports investigators with outstanding records of productivity in cancer research by providing funding and encouraging investigators to continue or embark on projects of unusual potential in cancer research.

Ribas’ recent clinical research led to the approval of Keytruda (pembrolizumab) for the treatment of advanced melanoma. Keytruda is the first-in-class PD-1-blocking immunotherapy approved by the U.S Food and Drug Administration. PD-1 is expressed by immune cells and acts as a brake, which, in turn, keeps them from recognizing and attacking cancer cells.

For many years, when using immunotherapy to fight cancer, the strategy has been to stimulate cells of the immune system so they could kill the cancer cells. However, this approach had limited success, because PD-1 prevented these cells from becoming active enough to attack the cancer. Keytruda, in effect, cuts the brake lines, freeing up the immune system to attack the cancer.

As part of the largest phase 1 study in the history of oncology, Ribas was principal investigator of the clinical trial that enrolled more than 600 patients with melanoma that had spread throughout their bodies. Because so many of the patients in the early testing showed significant long-lasting responses, the study was continued, and the FDA granted the drug "breakthrough therapy" status, allowing it to be fast-tracked for approval in October 2014.

With the NCI award, Ribas and colleagues hope to build upon his prior work and develop new and innovative bench-to-beside-and-back research studies, with the goal of developing patient-centric advances in cancer immunotherapy for melanoma.

“I am extremely grateful to receive this generous recognition of my research by the National Cancer Institute,” Ribas said. “Immunotherapy provides some patients with advanced cancer a realistic chance at long term survival. But currently it only benefits a subset of patients. With this award, my research group will study why some patients benefit and many others do not, and this knowledge will hopefully lead to the testing of new combination treatments to provide benefit to more patients.”