Live Breaking News & Updates on Rare diseases registry program rada

a rare, often deadly form of bone cancer that strikes roughly 1 of every 600,000 people. >> i went from when am i playing football again to when am i going to start treatment, what are my treatments going to be and what's chemotherapy like? am i going to live? >> reporter: he started a rigorous treatment schedule. chemotherapy for two months and then additional radiation therapy visits. his motivation, always being to get healthy and to get back to playing football. >> i knew that if i got back on the field that i would come full circle. i would have beaten the cancer, i would have gotten my physical strength back, to be where i want to be and be happy doing the thing i love to do. >> reporter: that internal drive is what helped mark mount a triumphant return. now he's cancer-free. he's back to playing football this fall. and football fans, young and old, are celebrating with him.

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