Sean J. Pittock, MD, Director of Mayo Clinic's Center for Multiple Sclerosis and Autoimmune Neurology and of Mayo's Neuroimmunology Laboratory discusses the latest results from Phase III CHAMPION-NMOSD trial recently presented at European Committee for Treatment and Research in Multiple Sclerosis (ECTRIMS) Congress. The results showed that treatment with ravulizumab-cwvz significantly reduced relapse risk in adults with anti-aquaporin-4 (AQP4) antibody-positive (Ab+) neuromyelitis optica spectrum disorder (NMOSD).NMOSD is a rare central nervous disorder that primarily affects the spinal cord and optic nerves. Symptoms of NMOSD may include blindness in one or both eyes, weakness or paralysis of arms or legs, spasming, loss of sensation, uncontrollable vomiting and hiccups, and bladder/bowel problems due to spinal cord damage. Relapse is very common in persons with NMOSD and episodes can be severe enough to cause permanent disability.