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Xenon Pharmaceuticals Receives FDA Feedback And Says Is On Track To Initiate XEN496 Phase 3 Clinical Trial For Treatment Of KCNQ2-DEE Before Year-End

BURNABY, British Columbia, Oct. 08, 2020 (GLOBE NEWSWIRE) -- Xenon Pharmaceuticals Inc. (NASDAQ:XENE), a neurology-focused biopharmaceutical company, today provided regulatory updates on its proprietary pediatric

· 10/08/2020 08:05

BURNABY, British Columbia, Oct. 08, 2020 (GLOBE NEWSWIRE) -- Xenon Pharmaceuticals Inc. (NASDAQ:XENE), a neurology-focused biopharmaceutical company, today provided regulatory updates on its proprietary pediatric neurology program, XEN496, a Kv7 potassium channel modulator that is a proprietary pediatric formulation of the active ingredient ezogabine being developed for the treatment of KCNQ2 developmental and epileptic encephalopathy (KCNQ2-DEE). With the U.S. Food and Drug Administration (FDA) having completed its review of the clinical trial protocol, Xenon is on track to initiate the XEN496 Phase 3 clinical trial in pediatric patients with KCNQ2-DEE before year-end.
 

In addition, Xenon has received a positive opinion from the Committee for Orphan Medicinal Products (COMP) of the European Medicines Agency (EMA), which recommends the granting of an orphan medicinal product designation for XEN496 for the treatment of KCNQ2-DEE. This European designation is in addition to the FDA granting Fast Track designation for XEN496 for the treatment of seizures associated with KCNQ2-DEE as well as Orphan Drug Designation (ODD) for the treatment of KCNQ2-DEE.

Dr. Simon Pimstone, Xenon's Chief Executive Officer, said, "This marks an extremely important milestone for Xenon, with the first of our proprietary product candidates now poised to enter a pivotal Phase 3 clinical trial. With feedback from the FDA, pharmacokinetic data supportive of our proprietary pediatric formulation, and considerable progress made in site selection and other preparations, we are excited to move forward with our ‘EPIK' Phase 3 clinical trial studying XEN496 in pediatric patients with KCNQ2-DEE. In addition, receiving an orphan medicinal product designation for XEN496 in Europe underscores that KCNQ2-DEE is a severe, early onset epilepsy disorder and further validates Xenon's novel, ‘precision medicine' approach to develop treatments for pediatric epilepsies. We continue to work closely with the medical community, genetic testing companies, and patient advocacy groups to identify potential patients for our EPIK study, which we expect to initiate before year-end."

The XEN496 Phase 3 "EPIK" clinical trial is titled "A Phase 3 Study of Adjunctive XEN496 in Pediatric Subjects with KCNQ2 Developmental and Epileptic Encephalopathy." This study is designed as a randomized, double-blind, placebo-controlled, parallel group, multicenter clinical trial to evaluate the efficacy, safety and tolerability of XEN496 administered as adjunctive treatment in approximately 40 pediatric patients aged one month to less than 6 years with KCNQ2-DEE. After screening, patients will enter a baseline period to assess the frequency of seizures. Eligible subjects will be randomized on a 1:1 basis to receive either XEN496 or placebo for approximately 15 weeks (titration and a 12-week maintenance period). At the end of treatment, there will be a period of tapering off of study drug, followed by a 28-day safety monitoring period. Patients may be considered for an open-label extension if they meet all requirements. The primary endpoint is the percent change from baseline in monthly countable motor seizure frequency during the blinded treatment period, as recorded by caregivers in a daily seizure diary. Key secondary endpoints include the proportion of patients experiencing greater than or equal to 50 percent reduction in monthly seizure frequency from baseline, caregiver global impression of change (CaGI-C) scores, and caregiver global impression of severity (CaGI-S) scores.