Researchers have reported the use of a stem cell gene therapy to treat nine people with the rare, inherited blood disease known as X-linked chronic granulomatous disease, or X-CGD. Six of those patients are now in remission and have stopped other treatments. Before now, people with X-CGD – which causes recurrent infections, prolonged hospitalizations for treatment, and a shortened lifespan — had to rely on bone marrow donations for a chance at remission.