Her parents refused to give up, however, and doctors, with the parents permission, decided on an experimental treatment that had worked with mice, but never had been tried with humans.
White blood cells, T cells, were taken from a healthy donor and modified so that they could seek out and kill drug-resistant leukaemia.
After the treatment, Layla began to improve almost immediately. A few weeks later, doctors told her parents that the treatment had worked.
They stress that it might not work for everyone and it is not a proven cure for leukaemia, but they are very excited for Layla and the future of "designer cell" treatments.