The Food and Drug Administration has approved a new treatment for advanced prostate cancer.
The treatment works by taking white blood cells out of the body, then mixing them with proteins and parts of cancer cells. The treatment is then injected back into the patient to energize the immune system.
During testing, patients lived an average of four months longer, but some lived years longer.
"This is something investigators have been trying decades to try to accomplish. That is, to try to use the immune system to fight cancer," Dr. Phillip Kantoff, with the Farber Cancer Institute, said.
Doctors hope the same process will one day be used to fight other types of cancer.