A seven-year-old girl with a form of congenital deafness regained nearly all of her hearing after receiving a new gene therapy, according to a study published in the journal Nature Medicine. As part of a clinical trial, the girl and nine other patients had a copy of the OTOF, or otoferlin, gene, which is crucial for hearing, injected into their inner ears. All of them reported improved hearing within a month, said The Independent, with "considerable" improvement after six months.