Dr. T. Clark Gamblin, a cancer survivor and practicing surgeon, spoke with Fox News Digital about running the World Marathon Challenge. He will run on all continents, including Antarctica, in seven consecutive days. (Photo credits: Jan Gamblin) Dr. T. Clark Gamblin, a cancer survivor and practicing surgeon, spoke with Fox News Digital about running the World Marathon Challenge. He will run on all continents, including Antarctica, in seven consecutive days. (Photo credits: Jan Gamblin)
