Large case controlled study... The magnitude of risk reduction varied by the quantity and types of antioxidants but reached a maximum of 67% in people who had the greatest intake of vitamins C and E and selenium

Even more remarkable, participants in the top 25 percent of consumption of vitamins C, E and selenium reduced their risk by 67 percent. The authors concluded that this amount of reduced risk could possibly prevent 8 percent of pancreatic cancers.