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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT02091206
Other study ID # GWEP1332 Part A
Secondary ID 2014-002941-23
Status Completed
Phase Phase 2
First received
Last updated
Start date October 22, 2014
Est. completion date March 9, 2015

Study information

Verified date September 2022
Source Jazz Pharmaceuticals
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

To evaluate the safety and pharmacokinetics (PK) of multiple doses of GWP42003-P compared with placebo in children with Dravet syndrome.


Description:

This multi-center study consisted of 2 parts: Part A and Part B. Only Part A is described in this record. Part A was a randomized, double-blind 21-day treatment study period. Participants were randomized to one of 3 doses of active drug or placebo at a 4:1 ratio. Participants who satisfied all inclusion and none of the exclusion criteria were assigned a unique participant number and then began a 28-day baseline observation period. Eligible participants were then randomly assigned to receive one of 3 dose levels of GWP42003-P: 5 milligrams (mg) per kilogram (kg) per day, 10 mg/kg/day, 20 mg/kg/day, or matching placebo. There were three groups of ten participants. In each group, participants were randomly assigned so that eight participants received active treatment and two participants received placebo. Participants received GWP42003-P or placebo for a 21-day exposure period, which consisted of a titration period, followed by a stable dose period. A PK assessment took place after the first single dose of GWP42003-P. There was a second PK assessment after 21 days of consecutive dosing with GWP42003-P. Participants who took clobazam (CLB) as an adjunctive treatment were asked to take their usual dose 2 hours prior to attending the clinic. The same recommendation was made for other concomitant antiepileptic drugs (AEDs), if applicable. This was so that the pre-treatment (with GWP42003-P) plasma concentrations of CLB, its major metabolite N-desmethylclobazam, and any other concomitant AEDs could be measured, and the impact of GWP42003-P treatment on these levels evaluated. Interim clinic visits to (primarily) evaluate safety and adherence to the titration regimen took place at 7 and 14 days of treatment. After 21 days of treatment, all participants commenced a 10-day down-titration taper period. An independent Data Safety Monitoring Committee reviewed unblinded safety and PK data and recommended the target dose (up to 20 mg/kg/day) for Part B of the study and for an open label extension study. Once the safety review of Part A data had taken place, participants had the option of entering the open label extension study. A follow-up telephone call was made 28 days after the end of dosing for participants who did not enter the open label extension study within this time-frame. Throughout the 21-day treatment period and the 10-day taper period, there were regular safety telephone calls (approximately every 2 days) to check participant status. Weekly safety telephone calls were made during the 28-day follow-up period.


Recruitment information / eligibility

Status Completed
Enrollment 34
Est. completion date March 9, 2015
Est. primary completion date March 9, 2015
Accepts healthy volunteers No
Gender All
Age group 4 Years to 10 Years
Eligibility Key Inclusion Criteria: - Participants were male or female aged between 4 and 10 years (inclusive). - Participants had a documented history of Dravet Syndrome that was not completely controlled by AEDs. - Participants took one or more AEDs at a dose which had been stable for at least 4 weeks. - Participants had experienced fewer than 4 convulsive seizures (tonic-clonic, tonic, clonic, atonic seizures) during the 28-day baseline period. - All medications or interventions for epilepsy (including ketogenic diet and vagus nerve stimulation [VNS]) were stable for four weeks prior to screening and participants were willing to maintain a stable regimen throughout the study. The ketogenic diet and VNS treatments were not counted as an AED. Key Exclusion Criteria: - Participants had clinically significant unstable medical conditions other than epilepsy. - Participants had clinically relevant abnormalities in the 12-lead electrocardiogram measured at screening or randomization. - Participants were currently using or had in the past used recreational or medicinal cannabis, or synthetic CBD based medications (including Sativex®) within the 3 months prior to study entry and were unwilling to abstain for the duration for the study. - Participants had any known or suspected hypersensitivity to cannabinoids or any of the excipients of the IMP. - Participants who had been part of a clinical trial involving another investigational product in the previous 6 months. - There were plans for the participants to travel outside their country of residence during the study. - Participants were previously randomized into this study. In particular, participants participating in Part A of the study cannot enter Part B.

Study Design


Related Conditions & MeSH terms


Intervention

Drug:
GWP42003-P 5 mg/kg/day Dose
GWP42003-P was an oral solution containing 25 mg/milliliter (mL) cannabidiol (CBD) or 100 mg/mL CBD dissolved in the excipients sesame oil and anhydrous ethanol (79 mg/mL) with added sweetener (0.5 mg/mL sucralose) and strawberry flavoring (0.2 mg/mL). Participants were randomly assigned to receive either 5, 10 or 20 mg/kg/day.
Placebo control
Placebo oral solution contained the excipients sesame oil and anhydrous ethanol (79 mg/mL) with added sweetener (0.5 mg/mL sucralose) and strawberry flavoring (0.2 mg/mL).
GWP42003-P 10 mg/kg/day Dose
GWP42003-P was an oral solution containing 25 mg/mL CBD or 100 mg/mL CBD dissolved in the excipients sesame oil and anhydrous ethanol (79 mg/mL) with added sweetener (0.5 mg/mL sucralose) and strawberry flavoring (0.2 mg/mL). Participants were randomly assigned to receive either 5, 10 or 20 mg/kg/day.
GWP42003-P 20 mg/kg/day Dose
GWP42003-P was an oral solution containing 25 mg/mL CBD or 100 mg/mL CBD dissolved in the excipients sesame oil and anhydrous ethanol (79 mg/mL) with added sweetener (0.5 mg/mL sucralose) and strawberry flavoring (0.2 mg/mL). Participants were randomly assigned to receive either 5, 10 or 20 mg/kg/day.

Locations

Country Name City State
n/a

Sponsors (1)

Lead Sponsor Collaborator
Jazz Pharmaceuticals

Countries where clinical trial is conducted

United States,  United Kingdom, 

References & Publications (1)

Devinsky O, Patel AD, Thiele EA, Wong MH, Appleton R, Harden CL, Greenwood S, Morrison G, Sommerville K; GWPCARE1 Part A Study Group. Randomized, dose-ranging safety trial of cannabidiol in Dravet syndrome. Neurology. 2018 Apr 3;90(14):e1204-e1211. doi: 10.1212/WNL.0000000000005254. Epub 2018 Mar 14. — View Citation

Outcome

Type Measure Description Time frame Safety issue
Primary Number Of Participants Who Experienced Severe Treatment-Emergent Adverse Events (TEAEs) A TEAE was defined as an adverse event (AE) with an onset date on or after the first dose of IMP. If an AE had a partial onset date and it was unclear from the partial date (or the stop date) whether the AE started prior to or following the first dose of IMP then the AE was considered a TEAE. The number of participants who experienced one or more severe TEAEs after dosing on Day 1 through the Safety Follow-up Visit (Day 60) is presented.
A summary of serious and all other non-serious AEs regardless of causality is located in the Adverse Events module.
Baseline (Day 1) through Safety follow-up visit (Day 60)
Secondary Area Under The Concentration-Time Curve Calculated To The Last Observable Concentration At Time T (AUC0-t) For CBD And Its Metabolites At Days 1 And 22 AUC0-t for CBD and its major metabolites, 6-hydroxy-CBD (6-OH-CBD), 7-hydroxy-CBD (7-OH-CBD), and 7-carboxy-CBD (7-COOH-CBD) were calculated using blood samples collected before and after IMP dosing on Days 1 and 22. One sample was collected predose, 2 to 3 hours postdose, and 4 to 6 hours postdose for CBD and its metabolites. Results are presented for participants who received GWP42003-P at 5, 10, or 20 mg/kg/day during the study and for participants with a numeric result for the given evaluation. Predose and 2-6 hours postdose on Days 1 and 22
Secondary Mean Percentage Change From Baseline To End Of Treatment In Plasma Clobazam (CLB) And N-Desmethylclobazam (N-CLB) Concentrations Plasma concentrations of CLB and N-CLB were measured on Days 1 and 22. Participants were instructed to take their daily dose of CLB 2 hours prior to the anticipated pre-IMP blood specimen collection on both days. Blood samples were collected prior to administration of IMP. Results are presented for a subgroup of participants who took CLB during the study and had PK samples analyzed at both PK sampling visits (Days 1 and 22). Predose on Days 1 and 22
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