Tristan Regini, 8, is raising money for the Colorado hospital that he says saved his friend's life. "My friend, Cade ... he had cancer," Tristan said on a recent chilly day, in between filling cups of hot chocolate for customers. "The Children's Hospital saved his life, so now I am trying to sponsor it even more." Cade Humphreys was diagnosed with a brain tumor two years ago, but has had no signs of the disease since April, Cade's family said. Tristan has raised $400 so far for Children's Hospital Colorado in Aurora, where Cade was treated, and he plans to donate even more.