It's one of the few that's still difficult to detect, and by the time you show symptoms you are basically stage 4... it's treatable if you catch it early, but therein lies the problem; My grandfather passed away from it.
He lived about a year after his diagnosis, which occurred when he was jaundice. His health / quality of life was ok after, some weeks were good, some were bad, but yeah it was stage 4 when they caught it, and there is / was only so much you can do, especially 23 years ago.
Fun Fact: He worked on the Univac! Spent his career with Unisys afterward.