Doctors Save A Little Girl's Life By Reprogramming The HIV Virus To Fight Cancer Cells

But then her parents put Emma through an experimental treatment at Children’s Hospital of Philadelphia.

They infected her with a version of HIV, reprogrammed to attack cancer cells.

Whitehead almost died, but the treatment worked and now she's in remission — and doing cartwheels all over her house.

Grady says the treatment hasn't worked for all patients.

It worked completely on three adults. Four treated adults have merely improved. A child relapsed. The treatment failed two adults completely.