US doctors in Philadelphia said they have saved a seven-year-old girl who was close to dying from leukemia with a pioneering use of an unlikely ally: a modified form of the HIV virus. After fighting her disease with chemotherapy for almost two years and suffering two relapses, the young girl “faced grim prospects,” doctors at Children’s Hospital of Philadelphia said. So in February this year they agreed to take her on in an experimental program that fought fire with fire.
