One of the greatest revolutions in the treatment of cancer is underway. It's called immunotherapy, and the revolutionary behind it is Dr. Steven Rosenberg. Dr. Rosenberg has been the Chief of Surgery at the National Institute of Cancer for over four decades. During all that time he has doggedly pursued this radical idea -- that a patient's immune system could be sparked or retrained to attack cancer cells. It's an idea that was dismissed by most of the medical establishment, until patients with terminal melanoma began to survive, cancer-free, under Dr. Rosenberg's care. Now immunotherapy is one of the hottest areas of medical research around the world. In this episode you'll hear the story of Dr. Rosenberg's almost super-human determination, and you'll hear from one of his patients.