@kilorenz – Overall, pancreatic cancer is the most deadly type. Over 90% of people that get pancreatic cancer die within five years of diagnosis. This is primarily because there is currently no test that can detect early signs of pancreatic cancer. By the time most people notice and report signs of pancreatic cancer, it is usually too developed for the victim to do much about it. Lung cancer is the second deadliest form of cancer. Around 75% of victims die within five years of diagnosis. Lung cancer is so deadly because it is difficult to operate on the lungs and impossible to remove them. Since the lungs communicate with so many other parts of the body, lung cancer has a high potential to spread to other parts of the body, making it that much more difficult to treat. Leukemia can also be fairly deadly form of cancer. Statistics on the mortality rate of leukemia are somewhat difficult to assess because there are multiple types of leukemia, some of which are far more deadly than others. Hope this helps.