Dude is definitely a fighter. They say if you keep a positive attitude about this kind of thing, you'll live longer than you would have if you just gave up from the jump.
My uncle went through this same shit, fought it for a few years, then gave up at the end by refusing more treatment when it was offered. Pancreatic cancer WILL kill you, and one can only take so much chemo and shit before they want it all to end.
My prayers go out to him and his family. He will be with us all forever though, with all he's done with his life.