This very scenario was exactly what happened to my Father-In-law. Also a brilliant man who was non-stop go. Diagnosed with pancreatic cancer and he was gone in six months.
Ironically, it is not the cancer type itself that makes it so deadly but the fact that the pancreas tolerates cancer so well. By the time you are diagnosed, it is beyond hope. If they could diagnose this just one month earlier than they currently do, the mortality rates would improve greatly.
How is Pancreatic Cancer detected? Do lab tests on blood samples spot it?