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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 treatment was 7-year-old emma whitehead. she is in complete remission. she has a ton of energy. she is doing wonderful right now. reporter: researchers report on the safety of the treatment in five more patients. what we saw just blew us away. the cancers went away in a matter of weeks, even days. reporter: days? days in one case.

Retro virusDavid rentaHuman immune systemsDisease fighting white blood cellsRobin robertsCancer fightersLiving drugEmma whitehead