Despite the speculation, the fact that he's resigning probably means his overall prognosis is poor.
Anyway, there are different types of pancreatic cancer. The most common is pancreatic adenocarcinoma - he doesn't have this. (Patrick Swazye did). He was first diagnosed in 2003ish...he would not be alive right now if it was pancreatic adenocarcinoma. He has a different type, an islet cell tumor, of which there can be different types. The prognosis is more individual...depends on the type of tumor and whether it's malignant. Give his frequent leaves of absence, it's probable he has had frequent recurrences and has metastatic disease, which means his overall prognosis is poor.