A new study shows that gene therapy can significantly improve hearing in people born with congenital deafness or severe hearing loss. Researchers at Karolinska Institutet, working with hospitals and universities in China, treated ten patients and saw hearing improve in every case. The therapy was also well-tolerated. The findings were published in the journal Nature Medicine. "This is a huge step forward in the genetic treatment of deafness, one that can be life-changing for children and adults,...