An international collaborative phase 1 study has shown that the injection of a specific form of stem cells into the brains of patients with progressive multiple sclerosis is safe and effective in preventing further brain damage. However, a different type of clinical trial is needed to address whether an advanced cell therapy made of brain-specific stem cells is indeed leading to amelioration of disease features. Take a deeper look into the findings from this study as Dr. Charles Turck speaks with the author of the study, Dr. Stefano Pluchino, Professor of Regenerative Neuroimmunology and Honorary Consultant in Neurology in the Department of Clinical Neurosciences at Cambridge University.