I bought the entire series of M*A*S*H some time back and have been watching it. I just finished watching the episode in season 9 of Blood Brothers.
Patrick Swayze guessed in this episode. He was a wounded GI that came in with another buddy. In Patrick's test they ran showed that he had terminalleukemia. It was really spooky to watch, now that we know he did die of pancreatic cancer.
I wonder how many remember this episode, it was sure weird to watch.