Stoke Therapeutics Granted FDA Orphan Drug Designation for STK-001

Stoke Therapeutics, Inc. announced that the U.S. Food and Drug Administration (FDA) has granted orphan drug designation to its lead product candidate, STK-001, an investigational new treatment for Dravet syndrome.

Dravet syndrome is a severe and progressive genetic epilepsy, characterized by frequent, prolonged and refractory seizures beginning within the first year of life. The effects of the disease go beyond seizures and often include cognitive regression or developmental stagnation, ataxia, speech impairment and sleep disturbances. Compared with the general epilepsy population, people living with Dravet syndrome have a higher risk of sudden unexpected death in epilepsy, or SUDEP. Approximately 85% of Dravet syndrome cases are caused by spontaneous, heterozygous loss of function mutations in the SCN1A gene. This gene encodes the voltage-gated sodium channel type 1 alpha subunit (NaV1.1). Currently available treatments do not address this mutation, the underlying cause of Dravet syndrome.

“The need for a medicine that will treat the underlying cause of Dravet syndrome is clear to anyone who has seen the devastating effects of the disease, and the significant impact it has on patients and their families,” said Barry S. Ticho, M.D., Chief Medical Officer of Stoke Therapeutics. “Our goal with STK-001 is to slow or even stop disease progression by treating the underlying cause of Dravet syndrome. STK-001 is designed to selectively upregulate one allele of the SCN1A gene to restore the protein expression to near-normal levels. We are on track to submit our investigational new drug application for STK-001 to the FDA in early 2020 and to begin a Phase 1/2 clinical study in the first half of the year.”

The FDA’s Office of Orphan Drug Products grants orphan status to support the development of medicines for safe and effective treatment, diagnosis or prevention of rare diseases or disorders that affect fewer than 200,000 people in the United States. Orphan drug designation entitles recipients to various development incentives, including tax credits for qualified clinical testing, an exemption from FDA application fees, and a seven-year period of marketing exclusivity in the United States, if the drug is approved.