A one-year-old girl in Britain has become the first in the world to be treated with “designer” immune cells genetically engineered to reverse her cancer, doctors said Thursday, reports  AFP from London. Layla Richards was suffering from leukaemia, but was cured after scientists used a new gene-editing technique to manipulate cells to fight the disease at Great Ormond Street Hospital (GOSH) in central London. “As this was the first time that the treatment had been used, we didn’t know if or when it would work and so we were over the moon when it did,” said Professor Paul Veys, director of bone marrow transplant at GOSH and Layla’s head doctor. “Her leukaemia was so aggressive that such a response is almost a miracle.” The baby was diagnosed with Acute Lymphoblastic Leukaemia, the most common form of childhood leukaemia, when she was just 14 weeks old.