David, a 2-year old with leukemia, was taken by him mother, Deborah, to Massachusetts General Hospital in Boston, to see Dr. John Truman who specializes in treating children with cancer and various blood diseases. Dr. Truman's prognosis was devastating: "He has a 50-50 chance." The countless clinic visits, the blood tests, the intravenous drugs, the fear and pain the mother's ordeal can be alm…