Detailed text transcripts for TV channel - KGO - 20130322:09:12:00
Out of options, he was being treated for leukemia, a rare and often fatal disease in adults. when chemotherapy failed, doctors turned to an experimental treatment. robin roberts went to visit him in december. >> i think i am on the right road. i think i am on the right road. >> reporter: doctors took out millions of david's disease fighting white blood cells. then used a retro virus which is great to getting into human immune systems to turn the cells into targeted cancer fighters. david's cells went back in and destroyed the cancer. acting like a living drug. the first patient to have similar...