Doctors in the United States are hopeful they have made a major breakthrough in the treatment of childhood leukaemia.
Seven-year-old Emily Whitehead - who was diagnosed with acute lymphoblastic leukaemia in 2010 - is now in remission after a pioneering treatment.
Emily, who had not responded to congenital therapy, took part in a clinical trial in which her immune system was effectively re-programmed to fight the disease.
So far - it seems to have worked.
Dr Stephan Grupp at the Children's Hospital of Philadelphia said: "We checked her three months and now six months after her treatment, she has no disease whatsoever."
ITV News' Medical Editor, Lawrence McGinty reports.