six years ago we introduce you'd to sean coleman, a top athlete. st. jude not only saved his life but kept his desire to play athletic football alive. >> reporter: 24-year-old sean coleman knew the world champion before his first game in the nfl. today, he's living his dream as offensive tackle for the feeling, something i had been working for since i was 5 years old, playing football. >> reporter: he already has won his biggest battle far more challening than any on the field. >> it's a blessing to be here, great opportunity. >> reporter: there was the time the thought of football seemed like a blessing that would never be his. >> i had a real bad flu and went to the doctor and dade couple of tests and we found out then. >> reporter: six years ago, sea athlete. after accepting a scholarship at football powerhouse, auburn university, he found out he had cancer. >> it was pretty crazy, scary not knowing what it would do. >> sean had the most common cancer in childhood. the survival rates are over 95%. talking about teenagers, the outcome is not as good