Under terms of the deal, Stoke will spearhead global development of zorevunersen, while Biogen will receive exclusive rights to commercialize the treatment outside of North America.

Biogen has entered a collaboration with Stoke Therapeutics to develop and and commercialise zorevunersen to treat Dravet syndrome in all territories outside Canada, Mexico and the US. Dravet syndrome is a genetic developmental and epileptic encephalopathy characterised by cognitive and behavioural impairments and recurrent seizures.

Stoke Therapeutics Inc. and Biogen Inc. said Tuesday they are entering a collaboration to develop and commercialize a treatment for Dravet syndrome, a severe form of epilepsy that starts in childhood.

Biogen and Stoke Therapeutics have announced a partnership aimed at advancing a disease-modifying treatment for Dravet syndrome, with the deal worth $550m.

Biogen (NASDAQ:BIIB) and Stoke Therapeutics (NASDAQ:STOK) said on Tuesday they are collaborating to develop and commercialize zorevunersen, an investigational treatment for Dravet syndrome, in territories outside the United States,

In exchange for $165 million, Biogen now has access to zorevunersen, a potential first-of-its-kind treatment for Dravet syndrome.

Biogen and Stoke Therapeutics have signed a deal to co-develop and sell Stoke’s experimental drug for Dravet syndrome, outside the U.S.

Biogen and Stoke partner on zorevunersen for Dravet syndrome, with a Phase 3 trial starting in 2025. Stoke gets $165 million upfront and milestone payments.