Cancer-battling actor Patrick Swayze's work ethic has left producers and co-stars on the set of his new TV show stunned.The 56-year-old Dirty Dancing star was diagnosed with pancreatic cancer in February, and was rumoured to have just months left to live.But Swayze is back at work putting in 12-hour days on the Chicago, Illinois set of The Beast.Producer Steven Pearl tells Us Weekly, "Watching Patrick on set is like watching a great workhorse."Patrick gets his 5.30am call and anytime we need him out there on the set, he's there, and he's there until wrap."

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