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Dog Sled Racer Lance Mackey Diagnosed With Cancer Again

Sad news ... Lance Mackey -- a 4-time Iditarod champion -- has been diagnosed with cancer again after battling the disease in 2001.

The legendary dog musher was first diagnosed with throat cancer back in 2001 -- and after surgery and radiation therapy, he was cancer-free.

But, Mackey announced on Tuesday via Facebook that the illness is back ... saying, "My winter plans just changed yet again."

"I was diagnosed with cancer again and being a single father has made sh* a bit different from my winter plans.