Here's the Enquirer story (emphasis mine):

‘Dirty Dancing’ star Patrick Swayze is in worse health than was feared as the pancreatic cancer he suffers from may have spread to his lungs.

The Hollywood actor (56) was admitted to hospital with pneumonia last week. US magazine the ‘National Enquirer’ reported that Swayze, who is apparently having difficulty breathing, may now have lung cancer.

One of his doctors told the magazine: “Patrick has never looked so bad.

"I have seen him many, many times, but he is now more ill than ever. He is in real pain.”
They only quoted the Enquirer, not a doc, as saying he may have lung cancer. And he has been in major pain since the treatments started - and refusing painkillers while he worked on the show "The Beast". LOTS of pain there, but no problems with him on the show.