You have to see this amazing video in which doctors describe the radical treatment they gave a six-year-old dying of leukemia - and how it worked.
Emma Whitehead, 6, was near death from leukemia after relapsing twice following chemotherapy, leaving doctors fresh out of options. Except one.
The Children's Hospital of Philadelphia used a disabled form of the virus that causes AIDS to reprogram her immune system genetically to kill cancer cells.
To access the full article, click here.