Gene editing saves girl dying in UK from leukaemia in world first.

Total remission, after chemotherapy and bone marrow transplant fails, in just 5 months. It is too soon to say she is cured, the team stressed at a press conference in London on 5 November. That will only become clear after a year or two. So far, though, she is doing well and there is no sign of the cancer returning. Other patients are already receiving the same treatment.
https://www.newscientist.com/article/dn28454-gene-editing-saves-life-of-girl-dying-from-leukaemia-in-world-first/