Key Takeaways Ionis' phase III study showed zilganersen stabilized gait speed in Alexander disease patients.The drug demonstrated favorable safety and consistent benefit across secondary measures.Ionis plans an FDA filing in Q1 2026 as it expands its wholly owned medicine portfolio.Ionis Pharmaceuticals (IONS) announced positive topline results from a pivotal phase III study evaluating its investigational RNA-targeted therapy zilganersen for treating a rare neurological condition called Alexander disease (A ...