Six years ago, Donna Gustafson was diagnosed with pancreatic cancer one of the deadliest cancers. Today, she's cancer-free. She’'s one of 16 patients in an early clinical trial testing a personalized mRNA cancer vaccine  designed to train the immune system to recognize and fight cancer.We hear from Donna and from the doctor leading the research, Dr. Vinod Balachandran, about what these early — but encouraging — results could mean. And we speak to Dr. Ramy Saleh, Associate Professor at McGill University, on how similar research is taking shape in Canada.