After losing most of my right leg at age 14 in November 2010 due to osteosarcoma, it was really hard for me to give up gymnastics. It had been my whole life up until then, and I’d been good enough at it that I was on track for a college scholarship.

But when the nagging knee pain I’d had for about a year turned out to be bone cancer instead of a sports injury, my parents and I came to MD Anderson. There, we met with Dr. Valerae...