A Phase 2, Multicenter, Randomized, Double-blind, Placebo-controlled Study to Evaluate the Efficacy, Safety, and Tolerability of TAK-935 (OV935) as an Adjunctive Therapy in Pediatric Participants With Developmental and/or Epileptic Encephalopathies (ELEKTRA)

Takeda

Status and phase: Completed; Phase 2

Conditions: Epilepsy; Lennox-Gastaut Syndrome; Dravet Syndrome

Treatments: Drug: TAK-935; Drug: Placebo

Study type: Interventional

Funder types: Industry

Identifiers

NCT03650452

U1111-1206-5522 (Other Identifier)

TAK-935-2002

2018-002484-25 (EudraCT Number)

Details and patient eligibility

About

The purpose of this study is to investigate the effect on the frequency of all seizures (convulsive and drop) in participants treated with TAK-935 compared to placebo.

Full description

The drug being tested in this study is called TAK-935 (OV935). This randomized, double-blind study will assess the effects of TAK-935 (OV935), compared to placebo, on efficacy, safety, and tolerability in pediatric participants with Dravet syndrome (DS) or Lennox Gastaut syndrome (LGS). This multi-center trial will be conducted worldwide and will enroll approximately 126 participants.

Participants will be randomized based on their diagnosis in 2 categories; DS or LGS. The study will consist of 2 periods: Screening Period and Treatment Period. The overall duration of Treatment Period is up to 20 weeks including 8-week Dose Optimization Period and 12-week Maintenance Period. The overall time to participants in this study is approximately 30 weeks.

Participants completing this study will have an option to enroll in the open-label extension study, under a separate protocol.

Enrollment: 141 patients

Sex: All

Ages: 2 to 17 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Male and female participants aged greater than or equal to (>=) 2 and less than or equal to (<=) 17 years
2. Clinical diagnosis of DS or LGS
3. Weight of >=10 kilogram (kg) at the Screening visit
4. Currently taking 1 to 4 anti-epileptic drugs (AEDs) at a stable dose
5. Failed to become and remain seizure free with trials of at least 2 AEDs

Exclusion criteria

1. Has been admitted to a medical facility and intubated for treatment of status epilepticus 2 or more times in the 3 months immediately prior to the screening visit
2. Non-epileptic events that cannot be reliably distinguished from epileptic seizures
3. Participation in a clinical study involving another study drug in the previous month

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Quadruple Blind

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141 participants in 2 patient groups, including a placebo group

Placebo

Placebo Comparator group

Description:

TAK-935 placebo-matching tablets, orally or via gastrostomy tube (G-tube)/percutaneous endoscopic gastrostomy (PEG), twice a day (BID) up to Week 20.

Treatment:

Drug: Placebo

TAK-935

Experimental group

Description:

TAK-935 tablets orally or via G-tube/PEG tube, BID. Participants weighing \<60 kg received total daily dose of study drug calculated based on body weight. Participants weighing ≥60 kg at Baseline, were administered with 200 mg/day followed by 400 mg/day, then 600 mg/day, up to Week 20.

Treatment:

Drug: TAK-935