Doctors say a stem cell transplant could be a "game changer" for many patients with multiple sclerosis. Results from an international trial show that it was able to stop the disease and improve symptoms. It involves wiping out a patient's immune system using cancer drugs and then rebooting it with a stem cell transplant. Just over 100 patients took part in the trial, in hospitals in Chicago, Sheffield, Uppsala in Sweden and Sao Paulo in Brazil. They all had relapsing remitting MS - where attacks or relapses are followed by periods of remission. The patients received either haematopoietic stem cell...