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SEP 23 2026
UPCOMING · 54 DAYS TO PDUFA

Ionis Pharmaceuticals zilganersen $IONS

for Alexander disease (GFAP-related leukodystrophy)

NDA · Priority Review · Breakthrough · Orphan

Accepted MAR 23 2026.

About

Alexander disease is a rare neurological disorder that damages the protective myelin around nerve fibers in the brain, typically causing developmental delays, loss of motor control, and seizures in children. Zilganersen is an antisense oligonucleotide designed to be delivered directly into the spinal fluid to reduce the production of the GFAP protein. By targeting this protein at its genetic source, the drug may help stabilize or improve motor function in affected individuals.

Pivotal trial

NCT04849741 Phase 3 active not recruiting NCT04849741

The purpose of this study is to evaluate the safety and efficacy of zilganersen (ION373) in improving or stabilizing gross motor function across the full range of affected domains in patients with AxD.

Source: ClinicalTrials.gov