Clinical Trial Results:
A Randomized, Double-blind, Placebo-controlled Study to Investigate the Efficacy and Safety of Cannabidiol (GWP42003-P; CBD) as Adjunctive Treatment for Seizures Associated With Lennox-Gastaut Syndrome in Children and Adults
Summary
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EudraCT number |
2014-002941-23 |
Trial protocol |
NL PL |
Global end of trial date |
18 Mar 2016
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Results information
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Results version number |
v1(current) |
This version publication date |
27 Sep 2018
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First version publication date |
27 Sep 2018
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Other versions |
Trial Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
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Trial identification
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Sponsor protocol code |
GWEP1423
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Additional study identifiers
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ISRCTN number |
- | ||
US NCT number |
NCT02224690 | ||
WHO universal trial number (UTN) |
- | ||
Sponsors
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Sponsor organisation name |
GW Research Ltd.
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Sponsor organisation address |
Sovereign House, Vision Park, Chivers Way, Histon, Cambridge, United Kingdom, CB24 9BZ
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Public contact |
GW Research Ltd., Alternate contact: medinfo@greenwichbiosciences.com, GW Research Ltd., medinfo@gwpharm.com
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Scientific contact |
GW Research Ltd., Alternate contact: medinfo@greenwichbiosciences.com, GW Research Ltd., medinfo@gwpharm.com
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Paediatric regulatory details
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Is trial part of an agreed paediatric investigation plan (PIP) |
Yes
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EMA paediatric investigation plan number(s) |
EMEA-001964-PIP01-16 | ||
Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Results analysis stage
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Analysis stage |
Final
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Date of interim/final analysis |
24 Feb 2017
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Is this the analysis of the primary completion data? |
Yes
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Primary completion date |
18 Mar 2016
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Global end of trial reached? |
Yes
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Global end of trial date |
18 Mar 2016
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Was the trial ended prematurely? |
No
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General information about the trial
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Main objective of the trial |
To evaluate the efficacy of GWP42003-P as adjunctive treatment in reducing the number of drop seizures when compared with placebo, in participants with Lennox-Gastaut Syndrome (LGS).
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Protection of trial subjects |
This study was conducted in accordance with International Council on Harmonisation (ICH) Good Clinical Practice, and the principles of the Declaration of Helsinki, in addition to following the laws and regulations of the country or countries in which a study is conducted. No study procedures were performed on study candidates until written consent had been obtained from the participant’s parent(s)/legal representative(s) and, if appropriate, written assent had been obtained from the participant. The informed consent form, protocol, and amendments for this study were submitted to and approved by the institutional review board or independent ethics committee at each participating study site.
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Background therapy |
- | ||
Evidence for comparator |
- | ||
Actual start date of recruitment |
28 Apr 2015
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Long term follow-up planned |
Yes
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Long term follow-up rationale |
Safety, Efficacy | ||
Long term follow-up duration |
4 Years | ||
Independent data monitoring committee (IDMC) involvement? |
Yes
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Population of trial subjects
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Number of subjects enrolled per country |
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Country: Number of subjects enrolled |
Netherlands: 5
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Country: Number of subjects enrolled |
Poland: 38
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Country: Number of subjects enrolled |
United States: 128
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Worldwide total number of subjects |
171
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EEA total number of subjects |
43
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Number of subjects enrolled per age group |
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In utero |
0
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Preterm newborn - gestational age < 37 wk |
0
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Newborns (0-27 days) |
0
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Infants and toddlers (28 days-23 months) |
0
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Children (2-11 years) |
76
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Adolescents (12-17 years) |
37
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Adults (18-64 years) |
58
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From 65 to 84 years |
0
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85 years and over |
0
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Recruitment
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Recruitment details |
- | ||||||||||||||||||||||||||||||
Pre-assignment
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Screening details |
The dose level of 20 milligram per kilogram per day (mg/kg/day) was recommended by the Data Safety Monitoring Committee (DSMC) of study GWEP1332 Part A (NCT02091206) after assessment of safety/pharmacokinetic data. The investigational medicinal product (IMP) was given daily in 2 doses to align with the preferred regimen for anti-epileptic drugs. | ||||||||||||||||||||||||||||||
Period 1
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Period 1 title |
Baseline, Treatment, and Follow-up (overall period)
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Is this the baseline period? |
Yes | ||||||||||||||||||||||||||||||
Allocation method |
Randomised - controlled
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Blinding used |
Double blind | ||||||||||||||||||||||||||||||
Roles blinded |
Subject, Investigator, Carer, Assessor | ||||||||||||||||||||||||||||||
Arms
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Are arms mutually exclusive |
Yes
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Arm title
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GWP42003-P 20 mg/kg/day Dose | ||||||||||||||||||||||||||||||
Arm description |
Participants received GWP42003-P 20 mg/kg/day administered orally, half in the morning and half in the evening. Participants titrated GWP42003-P to 20 mg/kg/day over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the open label extension (OLE) study, the maintenance period was followed by a 10-day taper (10% per day) period. | ||||||||||||||||||||||||||||||
Arm type |
Experimental | ||||||||||||||||||||||||||||||
Investigational medicinal product name |
GWP42003-P
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Investigational medicinal product code |
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Other name |
cannabidiol, CBD, Epidiolex
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Pharmaceutical forms |
Oral liquid, Oral solution
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Routes of administration |
Oral use
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Dosage and administration details |
GWP42003-P was presented as an oral solution containing 100 mg/milliliter (mL) cannabidiol (CBD) 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).
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Arm title
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Placebo | ||||||||||||||||||||||||||||||
Arm description |
Participants received placebo (0 mg/mL CBD), volume matched to the 20 mg/kg/day dose, administered orally, half in the morning and half in the evening. To maintain the blinded aspect of the study, participants titrated the placebo dose over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the OLE study, the maintenance period was followed by a 10-day taper (10% per day) period. | ||||||||||||||||||||||||||||||
Arm type |
Experimental | ||||||||||||||||||||||||||||||
Investigational medicinal product name |
Placebo
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Investigational medicinal product code |
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Other name |
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Pharmaceutical forms |
Oral suspension
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Routes of administration |
Oral use
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Dosage and administration details |
Placebo was presented as an oral solution containing 0 mg/mL CBD 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).
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Baseline characteristics reporting groups
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Reporting group title |
GWP42003-P 20 mg/kg/day Dose
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Reporting group description |
Participants received GWP42003-P 20 mg/kg/day administered orally, half in the morning and half in the evening. Participants titrated GWP42003-P to 20 mg/kg/day over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the open label extension (OLE) study, the maintenance period was followed by a 10-day taper (10% per day) period. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
Placebo
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Reporting group description |
Participants received placebo (0 mg/mL CBD), volume matched to the 20 mg/kg/day dose, administered orally, half in the morning and half in the evening. To maintain the blinded aspect of the study, participants titrated the placebo dose over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the OLE study, the maintenance period was followed by a 10-day taper (10% per day) period. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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End points reporting groups
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Reporting group title |
GWP42003-P 20 mg/kg/day Dose
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Reporting group description |
Participants received GWP42003-P 20 mg/kg/day administered orally, half in the morning and half in the evening. Participants titrated GWP42003-P to 20 mg/kg/day over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the open label extension (OLE) study, the maintenance period was followed by a 10-day taper (10% per day) period. | ||
Reporting group title |
Placebo
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Reporting group description |
Participants received placebo (0 mg/mL CBD), volume matched to the 20 mg/kg/day dose, administered orally, half in the morning and half in the evening. To maintain the blinded aspect of the study, participants titrated the placebo dose over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the OLE study, the maintenance period was followed by a 10-day taper (10% per day) period. | ||
Subject analysis set title |
GWP42003-P 20 mg/kg/day Dose-ITT Set
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Subject analysis set type |
Intention-to-treat | ||
Subject analysis set description |
Participants received at least 1 dose of IMP with at least 1 post-baseline efficacy endpoint measurement; analyzed according to the treatment group to which they received (GWP42003-P 20 mg/kg/day).
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Subject analysis set title |
Placebo-ITT Set
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Subject analysis set type |
Intention-to-treat | ||
Subject analysis set description |
Participants received at least 1 dose of IMP with at least 1 post-baseline efficacy endpoint measurement; analyzed according to the treatment group to which they received (Placebo).
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End point title |
Percentage Change From Baseline In Drop Seizure Frequency During The Treatment Period | ||||||||||||
End point description |
Drop seizures were recorded by the participant or caregiver using an interactive voice response system (IVRS) diary. Drop seizures were defined as the subset of tonic-clonic, tonic or atonic seizures that were reported as drop seizures in the IVRS. Percentage change from baseline was calculated as: ([frequency during the treatment period - frequency during baseline]/frequency during baseline) * 100. The frequency during each period was based on 28-day averages and calculated as: (number of seizures in the period/number of reported days in the IVRS period) *28. Baseline included all available data prior to Day 1 (28-day average). Negative percentages show an improvement from baseline.
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End point type |
Primary
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End point timeframe |
Baseline to End of Treatment (EOT) (Day 99) or Early Termination (ET)
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Statistical analysis title |
Change From Baseline in Drop Seizures 20 mg/kg/day | ||||||||||||
Statistical analysis description |
The P-value was calculated by using the Wilcoxon rank-sum test; the point estimate and confidence intervals were calculated by using the Hodges–Lehmann approach.
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Comparison groups |
GWP42003-P 20 mg/kg/day Dose-ITT Set v Placebo-ITT Set
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Number of subjects included in analysis |
171
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Analysis specification |
Pre-specified
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Analysis type |
superiority | ||||||||||||
P-value |
= 0.0135 | ||||||||||||
Method |
Wilcoxon rank sum test | ||||||||||||
Parameter type |
Mean difference (final values) | ||||||||||||
Point estimate |
-17.21
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Confidence interval |
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level |
95% | ||||||||||||
sides |
2-sided
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lower limit |
-30.32 | ||||||||||||
upper limit |
-4.09 |
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End point title |
Participants With ≥50% Reduction From Baseline in Drop Seizure Frequency During The Treatment Period | |||||||||
End point description |
Drop seizures were recorded by the participant or caregiver using an IVRS diary. Drop seizures included the subset of tonic-clonic, tonic or atonic seizures that were reported as drop seizures in IVRS. Percentage change from baseline was calculated as per the primary outcome measure.
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End point type |
Secondary
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End point timeframe |
Baseline to EOT (Day 99) or ET
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Statistical analysis title |
Number Of 50% Responders 20 mg/kg/day | |||||||||
Comparison groups |
GWP42003-P 20 mg/kg/day Dose-ITT Set v Placebo-ITT Set
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Number of subjects included in analysis |
172
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Analysis specification |
Pre-specified
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Analysis type |
superiority | |||||||||
P-value |
= 0.0043 [1] | |||||||||
Method |
Cochran-Mantel-Haenszel | |||||||||
Parameter type |
Odds ratio (OR) | |||||||||
Point estimate |
2.57
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Confidence interval |
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level |
95% | |||||||||
sides |
2-sided
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lower limit |
1.33 | |||||||||
upper limit |
4.97 | |||||||||
Notes [1] - Calculated using a Cochran-Mantel-Haenszel test stratified by age group (2-5, 6-11, 12-17 and 18-55 years) |
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End point title |
Percentage Change From Baseline In Total Seizure Frequency During The Treatment Period | ||||||||||||
End point description |
Total seizures included the sum of all seizures (tonic-clonic, tonic, atonic, clonic, myoclonic, countable partial, other partial, and absence seizures) recorded by the participant or caregiver using an IVRS diary. Percentage change from baseline was calculated as per the primary outcome measure. Negative percentages show an improvement from baseline.
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End point type |
Secondary
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End point timeframe |
Baseline to EOT (Day 99) or ET
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Statistical analysis title |
Change in Total Seizure Frequency 20 mg/kg/day | ||||||||||||
Statistical analysis description |
The P-value was calculated by using the Wilcoxon rank-sum test; the point estimate and confidence intervals were calculated by using the Hodges–Lehmann approach.
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Comparison groups |
GWP42003-P 20 mg/kg/day Dose-ITT Set v Placebo-ITT Set
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Number of subjects included in analysis |
171
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Analysis specification |
Pre-specified
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Analysis type |
superiority | ||||||||||||
P-value |
= 0.0005 | ||||||||||||
Method |
Wilcoxon rank sum test | ||||||||||||
Parameter type |
Median difference (final values) | ||||||||||||
Point estimate |
-21.13
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Confidence interval |
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level |
95% | ||||||||||||
sides |
2-sided
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lower limit |
-33.26 | ||||||||||||
upper limit |
-9.37 |
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End point title |
Subject/Caregiver Global Impression Of Change (S/CGIC) | ||||||||||||||||||||||||||||||
End point description |
The S/CGIC was used to assess the participant’s overall condition on a 7-point scale, using the markers “very much improved, much improved, slightly improved, no change, slightly worse, much worse, or very much worse” (1 = very much improved; 7 = very much worse). On Day 1 (prior to starting IMP), the caregiver was asked to write a brief description of the participant’s overall condition as a memory aid for the S/CGIC questionnaire at subsequent visits. If both a CGIC and SGIC were completed then the CGIC was used; if only a CGIC was completed then the CGIC was used; if only a SGIC was completed then the SGIC was used. Last visit for endpoints assessed at clinic visits was defined as the last scheduled visit (not including the end of taper or safety follow-up visits) at which participant’s last evaluation was performed.
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End point type |
Secondary
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End point timeframe |
Baseline to Last Visit (Day 99) or ET
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Statistical analysis title |
Subject/Caregiver Global Impression Of Change | ||||||||||||||||||||||||||||||
Statistical analysis description |
The odds ratio represents the odds of participant recording a lower score (improvement) on a continuous scale.
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Comparison groups |
GWP42003-P 20 mg/kg/day Dose-ITT Set v Placebo-ITT Set
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Number of subjects included in analysis |
171
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Analysis specification |
Pre-specified
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Analysis type |
superiority [2] | ||||||||||||||||||||||||||||||
P-value |
= 0.0012 | ||||||||||||||||||||||||||||||
Method |
Regression, Logistic | ||||||||||||||||||||||||||||||
Parameter type |
Odds ratio (OR) | ||||||||||||||||||||||||||||||
Point estimate |
2.54
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Confidence interval |
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level |
95% | ||||||||||||||||||||||||||||||
sides |
2-sided
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lower limit |
1.45 | ||||||||||||||||||||||||||||||
upper limit |
4.47 | ||||||||||||||||||||||||||||||
Notes [2] - Ordinal logistic regression model with treatment group as a fixed factor. |
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Adverse events information
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Timeframe for reporting adverse events |
Day 1 through Day 137 (Safety Follow-up)
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Adverse event reporting additional description |
Safety Analysis Set: All participants randomized to treatment who received at least 1 dose of IMP. Participants were analyzed according to the treatment group to which they received.
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Assessment type |
Systematic | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary used for adverse event reporting
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Dictionary name |
MedDRA | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary version |
17.1
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Reporting groups
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Reporting group title |
GWP42003-P 20 mg/kg/day Dose- Safety Set
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Reporting group description |
Participants received GWP42003-P 20 mg/kg/day administered orally, half in the morning and half in the evening. Participants titrated GWP42003-P to 20 mg/kg/day over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the OLE study, the maintenance period was followed by a 10-day taper (10% per day) period. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
Placebo- Safety Set
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Reporting group description |
Participants received placebo (0 mg/mL CBD), volume matched to the 20 mg/kg/day dose, administered orally, half in the morning and half in the evening. To maintain the blinded aspect of the study, participants titrated the placebo dose over 11 days and remained at this dose for the 12-week maintenance period. If the participant did not immediately enter the OLE study, the maintenance period was followed by a 10-day taper (10% per day) period. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Frequency threshold for reporting non-serious adverse events: 0.05% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Substantial protocol amendments (globally) |
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Were there any global substantial amendments to the protocol? Yes | |||
Date |
Amendment |
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13 Oct 2014 |
• Clarified the definition of drop seizure.
• Added a secondary objective/endpoint to evaluate change in duration of subtypes of seizures as assessed by the Combined Subject/Caregiver Global Impression of Change Score.
• Clarified the exclusion criteria addressing previous and current use of cannabinoids.
• Added additional collection of a full record of epilepsy-specific genetic testing and prior
antiepileptic drugs taken as part of the participant’s medical history for safety assessment and to
aid/confirm diagnosis of LGS.
• Clarified that IMP usage was recorded via the paper diary in
order to reduce the IVRS call time.
• Clarified that the baseline period must be a minimum of 28 days in order to capture sufficient baseline data.
• Clarified that the safety follow-up period must be a minimum of 28 days after EOT in order to capture sufficient safety data.
• Clarified the subtypes of seizures and definition of “countable partial seizures” in order to aid identification of seizure types.
• Clarified that the pre-randomization pregnancy test was performed using urine rather than serum in order to provide an immediate result for assessment of inclusion/exclusion criteria.
• Added the Pediatric Cannabinoid Withdrawal Scale for children 4–17 years of age.
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05 Feb 2015 |
• Clarified the definition of drop seizures by removal of ‘clonic’ and ‘myoclonic’ from the definition.
• Clarified the criteria for withdrawal.
• Added the following assessments to reflect the addition of secondary objectives: Pharmacokinetics, Cognitive Assessment Battery, Growth and Development measurements, Insulin-like growth factor-1 levels, menstruation and Tanner Staging.
• Updated references to reflect the latest safety information.
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03 Jun 2015 |
• Changed business address.
• Added age ranges to participant growth and development monitoring of IGF-1 levels and Tanner
Staging.
• Reclassified menstruation as a safety measure, rather than an efficacy measure.
• Clarified the PK monitoring of CBD and its major metabolites based on participants weight.
• Clarified the statistical methods for the primary and secondary endpoints.
• Clarified ‘End of Treatment’ visit and withdrawal visit procedures.
• Clarified the exclusion criteria relating to hepatic function.
• Added clinical laboratory sample measurement of serum triglycerides and blood urea nitrogen.
• Added participant stratification by age across treatment arms.
• Added follow-up procedures for potential cases of drug-induced liver injury.
• Increased participant numbers based on expanded review of published clinical trial data.
• Amended responder and sensitivity analysis.
• Updated eligibility criteria contraception requirements.
• Updated eligibility criteria compliance statement.
• Updated the cognitive assessment battery by removing the Socioeconomic Scale test and allowing
a +3 day window for completion on a separate day if necessary.
• Added antiepileptic drug monitoring as secondary objective/endpoint.
• Clarified liver function testing.
• Updated recommended target dose and titration regimen based on the Data Safety Monitoring Committee of trial GWEP1332 Part A.
• Clarified drop seizure inclusion criteria.
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19 Jun 2015 |
• Clarification of eligibility was incorporated.
• Clarification of trial procedures
• Updated eligibility criteria regarding impaired hepatic function. |
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Interruptions (globally) |
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Were there any global interruptions to the trial? No | |||
Limitations and caveats |
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Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data. | |||
None reported | |||
Online references |
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http://www.ncbi.nlm.nih.gov/pubmed/29395273 |