Seven-year-old makes extraordinary recovery after U.S. doctors re-wire her immune system to destroy leukaemia cells:
- Emily had been fighting leukaemia for two years but relapsed this spring
- Her parents put her forward for a clinical trial as it was 'the only option left'
- 'We had 48 hours to make a decision or Emily could have started having organ failure', father said
- Therapy, known as CTL019, used disabled form of HIV to reprogramme her immune system to kill cancer cells