United States, Sept. 4 -- The U.S. Food and Drug Administration has approved Zanvastro (zilganersen) injection for the treatment of Alexander disease in pediatric and adult patients. Zanvastro is the first FDA-approved treatment for Alexander disease and the first therapy to directly target the protein buildup that drives the disease. Alexander disease is a rare, progressive neurological disorder caused by mutations in the gene that produces glial fibrillary acidic protein (GFAP). When this protein is abnormal, it accumulates in the brain's supportive cells, causing damage to the nervous system over time. The disease affects less than 1 in a million people and can cause a wide range of serious and potentially life-threatening problems, incl...