A new vaccine aimed at a common cancer gene mutation could help stop aggressive pancreatic cancers from coming back, a small clinical trial suggests. Pancreatic cancer is one of the most lethal cancers, with a five-year survival rate of about 13%, according to the American Cancer Society . Further, up to 80% of cases return after treatment, the National Institutes of Health says. "If you were to ask me what disease most needs something to prevent recurrences, I'd say this one," Dr. Zev Wainberg