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Zilganersen 50 mg met the primary endpoint of gait speed stabilization (10MWT) with a 33.3% mean difference vs control (p=0.0412) at week 61. The company plans NDA submission in Q1 2026, marking the first disease-modifying therapy to show benefit in this rare neurological condition.
EX-99.1 2 ef20055880_ex99-1.htm EXHIBIT 99.1 Exhibit 99.1 Ionis announces positive topline results from pivotal study of zilganersen in Alexander disease – First and only investigational medicine to demonstrate a clinically meaningful and disease-modifying impact on this rare, often fatal neurological condition – – NDA submission planned in Q1 2026 – CARLSBAD, Calif., Sept. 22, 2025 – Ionis Pharmaceuticals, Inc. (Nasdaq: IONS) today announced positive topline results from the pivotal study of zilganersen in children and adults living with Alexander disease (AxD), a rare, progressive and often fatal neurological condition with no approved disease-modifying treatments. Zilgane rsen 50 mg demonstrated statistically significant and clinically meaningful stabilization on the primary endpoi