Stoke Therapeutics, Inc. (NASDAQ:STOK), a biotechnology company dedicated to restoring protein expression by harnessing the body’s potential with RNA medicine, and Biogen Inc. (NASDAQ:BIIB) today announced presentations of data at the 16th European Epilepsy Congress (EEC), taking place September 5-9 in Athens, Greece. These data support the potential of zorevunersen as a first-in-class disease-modifying treatment for Dravet syndrome. Dravet syndrome is a severe developmental and epileptic encephalopathy (DEE) characterized by recurrent seizures as well as significant cognitive and behavioral impairments.

Data presented at EEC represent more than 5 years of clinical experience with zorevunersen in patients with Dravet syndrome, including two Phase 1/2a and ongoing open-label extension studies (OLEs). Four-year OLE results showed substantial and durable reductions in seizures and continuing improvements in cognition and behavior. A new exploratory sub-analysis also showed substantial reductions in the most severe seizure types, which are the leading risk factor for sudden unexpected death in epilepsy (SUDEP)1. SUDEP is the primary cause of premature death in Dravet syndrome2, and up to 20% of children and adolescents with the disease die before reaching adulthood3. An additional sub-analysis presented at EEC demonstrated substantial improvements in quality of life through 28 months in the OLEs. Zorevunersen continues to be generally well tolerated in the OLEs.