Stoke Therapeutics, Biogen report 4-year open-label data for Dravet drug zorevunersen showing durable seizure reduction

• Stoke Therapeutics, Biogen flagged long-term zorevunersen data for Dravet syndrome, scheduled for presentation at the European Epilepsy Congress.
• Long-running extension studies showed sustained seizure control, with continued gains in cognition, behavior, quality of life over multiple years.
• An exploratory analysis indicated fewer severe seizure types linked to SUDEP risk, supporting a potential disease-modifying profile.
• The pivotal Phase 3 EMPEROR trial finished enrollment for its primary analysis population, with results expected in Q3 2027.
• Stoke plans a rolling FDA NDA in H2 2027 if Phase 3 data support filing; long-term dosing remained generally well tolerated.

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