A groundswell of research on the immune system is yielding a deeper understanding of how cancer progresses and offering new ways to stop it. As a result of these efforts, a range of cancer therapies are under development that work by turning our own immune cells against tumours.
Carley Rutledge is studying biology at university in Colorado. She loves hiking and hanging out with friends. Many of us take these things for granted, but for Carley they are only possible because she's taking part in a trial for a cancer vaccine. Without the trial, Carley would have been stuck in hospital having a second round of chemotherapy. Carley tells her story in this film. We also hear from her doctors, who are pioneering this new personalized cancer treatment that uses a patient's own immune system to fight the disease.