facing. as wayne freedman reports, they are getting much more support than they ever imagined. >> you are looking at one of the best times in life. the innocence of youth, the passion of an organized sport like bmx racing. >> he loves it more than anything else in life which is really quite revealing. 24 hours earlier he was actively fighting for that life awaiting two big khaem chemotherapy injections. >> leukemia. >> it came about all of a sudden. >> for luke's father and mother, there are no easy answers to the question of why. >> initially it is shock, heartbreak. >> replaced by determination to endure the treatment at lucille packard children's hospital. they are getting support from all places, very same races they try to hard to win every