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High materiality7/10

Biogen-Stoke Dravet data boosts zorevunersen value; EMPEROR readout in 2027

Sep 3, 2026, 7:32 PM EDT1 sourcesAI-analyzed

Why it may matterVerify against the original reporting

Direct link to BIIB through the Stoke collaboration and upcoming EMPEROR readout provides potential upside in milestones/royalties; positive long-term therapeutic narrative for BIIB's portfolio, though magnitude depends on EMPEROR results and commercial uptake.

AI summary

What happened, with direct paths to the underlying reporting

New data from Phase 1/2a and open-label extensions show four-year, durable seizure reductions and ongoing cognitive/behavioral gains with zorevunersen in Dravet syndrome. Substantial reductions in severe seizures and improved quality of life through 28 months were reported. Phase 3 EMPEROR readout is due in Q3 2027 to support a rolling NDA, with Biogen/Stoke RoW commercialization rights.

4-year OLE shows durable seizure reductions with zorevunersen on top of ASMs. Cognition and behavior improve.
Severe seizures (GTC, focal-to-BTC) reduced; SUDEP risk factors addressed.
Quality of life improved through 28 months in OLEs.
Phase 3 EMPEROR data readout expected Q3 2027; rolling NDA planned in H2 2027.
Biogen-Stoke collaboration grants RoW rights to Biogen; Stoke retains US/Canada/Mexico.

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