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    Clinical Trial Results:
    A Multicenter, Open-label, Pilot Study of TAK-935 (OV935) in Patients With 15Q Duplication Syndrome or CDKL5 Deficiency Disorder (ARCADE Study)

    Summary
    EudraCT number
    2022-001315-44
    Trial protocol
    Outside EU/EEA  
    Global end of trial date
    31 Jul 2020

    Results information
    Results version number
    v1(current)
    This version publication date
    15 Jul 2022
    First version publication date
    15 Jul 2022
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    TAK-935-18-002 (OV935)
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT03694275
    WHO universal trial number (UTN)
    U1111-1219-5787
    Sponsors
    Sponsor organisation name
    Takeda
    Sponsor organisation address
    95 Hayden Avenue, Lexington, MA, United States, 02421
    Public contact
    Study Director, Takeda, TrialDisclosures@takeda.com
    Scientific contact
    Study Director, Takeda, TrialDisclosures@takeda.com
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    Yes
    EMA paediatric investigation plan number(s)
    EMEA-002572-PIP01-19
    Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Results analysis stage
    Analysis stage
    Final
    Date of interim/final analysis
    31 Jul 2020
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    31 Jul 2020
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    The main objective of the trial was to investigate the effect of TAK-935 (soticlestat) on the frequency of motor seizures for participants with 15q duplication syndrome (Dup15q) or cyclin-dependent kinase-like 5 deficiency disorder (CDD) during the Maintenance Period.
    Protection of trial subjects
    Study participants were required to read and sign an Informed Consent Form.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    10 Sep 2018
    Long term follow-up planned
    No
    Independent data monitoring committee (IDMC) involvement?
    No
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    United States: 20
    Worldwide total number of subjects
    20
    EEA total number of subjects
    0
    Number of subjects enrolled per age group
    In utero
    0
    Preterm newborn - gestational age < 37 wk
    0
    Newborns (0-27 days)
    0
    Infants and toddlers (28 days-23 months)
    0
    Children (2-11 years)
    9
    Adolescents (12-17 years)
    9
    Adults (18-64 years)
    2
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    Participants took part in the study at 8 investigative sites in the United States from 10 September 2018 to 31 July 2020.

    Pre-assignment
    Screening details
    Participants with a diagnosis of Dup15q or CDD were enroled in 2 cohorts to receive treatment with TAK-935 for up to 20 weeks Treatment Period (8-week Dose Optimisation Period and 12-week Maintenance Period).

    Period 1
    Period 1 title
    Overall Study (overall period)
    Is this the baseline period?
    Yes
    Allocation method
    Non-randomised - controlled
    Blinding used
    Not blinded

    Arms
    Are arms mutually exclusive
    Yes

    Arm title
    Soticlestat Dup15q
    Arm description
    Soticlestat tablets twice daily (BID) orally or via gastrostomy tube (G-tube)/ percutaneous endoscopic gastrostomy (PEG) tube, BID. Participants with Dup15q weighing <60 kg at Baseline 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.
    Arm type
    Experimental

    Investigational medicinal product name
    Soticlestat
    Investigational medicinal product code
    Other name
    TAK-935
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    TAK-935 tablets

    Arm title
    Soticlestat CDD
    Arm description
    Soticlestat tablets BID orally or via G-tube/ PEG tube, BID. Participants with CDD weighing <60 kg at Baseline 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.
    Arm type
    Experimental

    Investigational medicinal product name
    Soticlestat
    Investigational medicinal product code
    Other name
    TAK-935
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    TAK-935 tablets

    Number of subjects in period 1
    Soticlestat Dup15q Soticlestat CDD
    Started
    8
    12
    Completed
    8
    10
    Not completed
    0
    2
         Adverse event, non-fatal
    -
    1
         Reason not Specified
    -
    1

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Soticlestat Dup15q
    Reporting group description
    Soticlestat tablets twice daily (BID) orally or via gastrostomy tube (G-tube)/ percutaneous endoscopic gastrostomy (PEG) tube, BID. Participants with Dup15q weighing <60 kg at Baseline 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.

    Reporting group title
    Soticlestat CDD
    Reporting group description
    Soticlestat tablets BID orally or via G-tube/ PEG tube, BID. Participants with CDD weighing <60 kg at Baseline 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.

    Reporting group values
    Soticlestat Dup15q Soticlestat CDD Total
    Number of subjects
    8 12
    Age Categorical
    Units: Subjects
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    15.4 ( 6.00 ) 7.6 ( 5.30 ) -
    Gender categorical
    Units: Subjects
        Male
    5 3 8
        Female
    3 9 12
    Ethnicity
    Units: Subjects
        Hispanic or Latino
    0 0 0
        Not Hispanic or Latino
    8 12 20
        Unknown or Not Reported
    0 0 0
    Race
    Units: Subjects
        White
    8 11 19
        Unknown or Not Reported
    0 1 1
    Height
    Units: cm
        arithmetic mean (standard deviation)
    148.54 ( 14.965 ) 124.59 ( 26.882 ) -
    Weight
    Units: kg
        arithmetic mean (standard deviation)
    43.40 ( 13.678 ) 26.28 ( 12.511 ) -
    Body Mass Index (BMI)
    BMI= weight (kg)/height (m^2).
    Units: kg/m^2
        arithmetic mean (standard deviation)
    19.21 ( 4.149 ) 16.00 ( 1.874 ) -

    End points

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    End points reporting groups
    Reporting group title
    Soticlestat Dup15q
    Reporting group description
    Soticlestat tablets twice daily (BID) orally or via gastrostomy tube (G-tube)/ percutaneous endoscopic gastrostomy (PEG) tube, BID. Participants with Dup15q weighing <60 kg at Baseline 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.

    Reporting group title
    Soticlestat CDD
    Reporting group description
    Soticlestat tablets BID orally or via G-tube/ PEG tube, BID. Participants with CDD weighing <60 kg at Baseline 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.

    Primary: Percent Change from Baseline in Motor Seizure Frequency per 28 Days During the Maintenance Period

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    End point title
    Percent Change from Baseline in Motor Seizure Frequency per 28 Days During the Maintenance Period [1]
    End point description
    Seizure frequency per 28 days was defined as total number of Seizures reported during the period divided by number of days with no missing seizure count during the period multiplied by 28. Percent Change from Baseline was defined as (frequency of seizures per 28 days during Maintenance Period – frequency of seizures per 28 days at Baseline) divided by frequency of seizures per 28 days at Baseline multiplied by 100. Positive percent change from Baseline indicates seizure increase and negative percent change from Baseline indicates seizure decrease. Modified Intent-to-Treat (mITT) Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed are the number of participants with data available for analyses.
    End point type
    Primary
    End point timeframe
    Maintenance Period: Weeks 9 to 20
    Notes
    [1] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point.
    Justification: Only descriptive statistics was planned to be reported for this endpoint.
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    11
    Units: percent change
        median (full range (min-max))
    11.7 (-90 to 39)
    -23.6 (-100 to 107)
    No statistical analyses for this end point

    Secondary: Percent Change from Baseline in Motor Seizure Frequency per 28 Days During the Treatment Period

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    End point title
    Percent Change from Baseline in Motor Seizure Frequency per 28 Days During the Treatment Period
    End point description
    Seizure frequency per 28 days was defined as total number of Seizures reported during the period divided by number of days with no missing seizure count during the period multiplied by 28. Percent Change from Baseline was defined as (frequency of seizures per 28 days during the treatment period – frequency of seizures per 28 days at Baseline) divided by frequency of seizures per 28 days at Baseline multiplied by 100. Positive percent change from Baseline indicates seizure increase and negative percent change from Baseline indicates seizure decrease. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period.
    End point type
    Secondary
    End point timeframe
    Treatment Period: Weeks 0 to 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    12
    Units: percent change
        median (full range (min-max))
    13.4 (-89 to 30)
    -13.6 (-93 to 48)
    No statistical analyses for this end point

    Secondary: Percentage of Participants Considered as Treatment Responders During the Maintenance Period

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    End point title
    Percentage of Participants Considered as Treatment Responders During the Maintenance Period
    End point description
    Responders were defined as having over 50% motor seizure reduction compared to Baseline. Percent reduction from Baseline (%) was defined as [(Maintenance Period motor Seizure Frequency -Baseline Period motor Seizure Frequency) divided by Baseline motor Seizure Frequency] multiplied by 100. Data is reported as reduction of 25%, 50%, 75% and 100% or more in motor seizures from Baseline. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed are the number of participants with data available for analyses.
    End point type
    Secondary
    End point timeframe
    Maintenance Period: Weeks 9 to 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    11
    Units: percentage of participants
    number (not applicable)
        <=0% Reduction
    62.5
    27.3
        >0% to <25% Reduction
    12.5
    27.3
        >=25% to <50% Reduction
    12.5
    18.2
        >=50% to <75% Reduction
    0
    18.2
        >=75% to 100% Reduction
    12.5
    9.1
    No statistical analyses for this end point

    Secondary: Percent Change from Baseline in Frequency of Motor Seizures Longer Than 5 Minutes in Participants with CDD

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    End point title
    Percent Change from Baseline in Frequency of Motor Seizures Longer Than 5 Minutes in Participants with CDD [2]
    End point description
    Seizure frequency was defined as total number of Seizures reported during the period divided by number of days with no missing seizure count during the period. Percent Change from Baseline was defined as (frequency of seizures during Treatment period –frequency of seizures at Baseline) divided by frequency of seizures at Baseline multiplied by 100. Positive percent change from Baseline indicates seizure increase and negative percent change from Baseline indicates seizure decrease. The data is reported only for CDD participants. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed are all participants whose analyses were conducted using observed values and no imputation was done for missing data.
    End point type
    Secondary
    End point timeframe
    Treatment Period: Weeks 0 to 20
    Notes
    [2] - The end point is not reporting statistics for all the arms in the baseline period. It is expected all the baseline period arms will be reported on when providing values for an end point on the baseline period.
    Justification: Only descriptive statistics was planned to be reported for this endpoint.
    End point values
    Soticlestat CDD
    Number of subjects analysed
    6
    Units: percent change
        median (full range (min-max))
    -54.0 (-86 to 11)
    No statistical analyses for this end point

    Secondary: Proportion of Motor Seizure-free Days in Participants During the Maintenance Period

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    End point title
    Proportion of Motor Seizure-free Days in Participants During the Maintenance Period
    End point description
    Seizure-free days was defined as number of days with zero motor seizure during the period the Maintenance Period divided by number of days participant was in the Maintenance Period. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed are the number of participants with data available for analyses.
    End point type
    Secondary
    End point timeframe
    Maintenance Period: Weeks 9 to 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    11
    Units: days/28 days
        median (full range (min-max))
    0.1 (0 to 1)
    0.1 (0 to 1)
    No statistical analyses for this end point

    Secondary: Change From Baseline in Clinician's Global Impression of Severity (CGI-S) Responses of Investigator

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    End point title
    Change From Baseline in Clinician's Global Impression of Severity (CGI-S) Responses of Investigator
    End point description
    The CGI-S focuses on clinician's observations of the participant’s cognitive, functional, and behavioral performance since the beginning of the study. The CGI-S is rated on a 7-point scale, with the severity of illness scale using a range of responses where, 1= normal, not at all ill, 2= borderline mentally ill, 3= mildly ill, 4= moderately ill, 5= markedly ill, 6= severely ill and 7=amongst the most extremely ill participants. Negative change from Baseline indicates improvement. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. 'n'= number analysed is the number of participants with data available for analyses at the given timepoint.
    End point type
    Secondary
    End point timeframe
    Baseline to Week 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    12
    Units: score on scale
    median (full range (min-max))
        Baseline (n=8,12)
    5.0 (4 to 6)
    5.0 (4 to 6)
        Change From Baseline at Week 20 (n=6,12)
    0.0 (-2 to 0)
    0.0 (-1 to 1)
    No statistical analyses for this end point

    Secondary: Percentage of Participants with Clinical Global Impression of Change (CGI-C) Responses as per the Investigator Reported Impression

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    End point title
    Percentage of Participants with Clinical Global Impression of Change (CGI-C) Responses as per the Investigator Reported Impression
    End point description
    CGI-C treatment response ratings should take account of both therapeutic efficacy and treatment-related AEs. Each component of the CGI is rated separately; the instrument does not yield a global score. The CGI-C is rated on a 5-point scale, where, 0 = marked improvement and no side-effects, 1 = marked improvement and minimal side-effects, 2 = no change, 3 = minimal improvement and marked side-effects and 4 = unchanged or worse and side effects outweigh the therapeutic effect. Lower scores indicated improvement. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed are the number of participants with data available for analyses.
    End point type
    Secondary
    End point timeframe
    Week 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    6
    12
    Units: percentage of participants
    number (not applicable)
        Week 20, Score 0
    33.3
    33.3
        Week 20, Score 1
    0
    33.3
        Week 20, Score 2
    50.0
    33.3
        Week 20, Score 3
    16.7
    0
        Week 20, Score 4
    0
    0
    No statistical analyses for this end point

    Secondary: Percentage of Participants with Care Clinical Global Impression of Change (CGI-C) Responses of Parent/Family

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    End point title
    Percentage of Participants with Care Clinical Global Impression of Change (CGI-C) Responses of Parent/Family
    End point description
    CGI-C treatment response ratings should take account of both therapeutic efficacy and treatment-related AEs. Each component of the CGI is rated separately; the instrument does not yield a global score. The CGI-C is rated on a 7-point scale where, 1 = very much improved, 2 = much improved, 3 = slightly improved, 4= no change, 5= slightly worse, 6= much worse and 7= very much worse and marked side-effects. Lower scores indicated improvement. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed are the number of participants with data available for analyses.
    End point type
    Secondary
    End point timeframe
    Week 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    6
    12
    Units: percentage of participants
    number (not applicable)
        Week 20, Score 1
    0
    16.7
        Week 20, Score 2
    16.7
    25.0
        Week 20, Score 3
    33.3
    50.0
        Week 20, Score 4
    50.0
    0
        Week 20, Score 5
    0
    8.3
        Week 20, Score 6
    0
    0
        Week 20, Score 7
    0
    0
    No statistical analyses for this end point

    Secondary: Change from Baseline of Plasma 24S-hydroxycholesterol (24HC) Levels

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    End point title
    Change from Baseline of Plasma 24S-hydroxycholesterol (24HC) Levels
    End point description
    mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period. Overall subjects analysed is the number of participants with data available for analyses. 'n'=number analysed is the number of participants with data available for analyses at the given timepoint.
    End point type
    Secondary
    End point timeframe
    Baseline to Week 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    11
    Units: ng/mL
    arithmetic mean (standard deviation)
        Baseline (n=8,11)
    57.08 ( 24.195 )
    115.29 ( 73.587 )
        Change from Baseline at Week 20 (n=4,5)
    -34.71 ( 16.578 )
    -75.64 ( 29.284 )
    No statistical analyses for this end point

    Secondary: Change from Baseline in Seizure Frequency in Participants Treated with TAK-935 as an Adjunctive Therapy

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    End point title
    Change from Baseline in Seizure Frequency in Participants Treated with TAK-935 as an Adjunctive Therapy
    End point description
    Seizure Frequency per 28 days was defined as total number of Seizures reported during the period divided by number of days with no missing seizure during the period seizures were assessed multiplied by 28. Positive change from Baseline indicates seizure increase and negative change from Baseline indicates seizure decrease. mITT Analysis Set included all participants who have received at least 1 dose of study drug and have been assessed for at least 1 day in the Treatment Period.
    End point type
    Secondary
    End point timeframe
    Baseline to Week 20
    End point values
    Soticlestat Dup15q Soticlestat CDD
    Number of subjects analysed
    8
    12
    Units: seizures per 28 days
    median (full range (min-max))
        Baseline
    128.4 (35 to 224)
    77.8 (10 to 374)
        Change From Baseline at Week 20
    13.2 (-31 to 67)
    -3.4 (-210 to 28)
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    From the first dose to 30 days post-last dose of study treatment (Up to 24 weeks)
    Adverse event reporting additional description
    At each visit the investigator had to document any occurrence of adverse events and abnormal laboratory findings. Any event spontaneously reported by the participant or observed by the investigator was recorded, irrespective of the relation to study treatment.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    22.0
    Reporting groups
    Reporting group title
    Soticlestat Dup15q
    Reporting group description
    Soticlestat tablets twice daily (BID) orally or via gastrostomy tube (G-tube)/ percutaneous endoscopic gastrostomy (PEG) tube, BID. Participants with Dup15q weighing <60 kg at Baseline 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.

    Reporting group title
    Soticlestat CDD
    Reporting group description
    Soticlestat tablets BID orally or via G-tube/ PEG tube, BID. Participants with CDD weighing <60 kg at Baseline 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.

    Serious adverse events
    Soticlestat Dup15q Soticlestat CDD
    Total subjects affected by serious adverse events
         subjects affected / exposed
    1 / 8 (12.50%)
    2 / 12 (16.67%)
         number of deaths (all causes)
    0
    0
         number of deaths resulting from adverse events
    0
    0
    Immune system disorders
    Anaphylactic reaction
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Respiratory, thoracic and mediastinal disorders
    Acute respiratory failure
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Infections and infestations
    Respiratory syncytial virus bronchiolitis
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 0%
    Non-serious adverse events
    Soticlestat Dup15q Soticlestat CDD
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    7 / 8 (87.50%)
    12 / 12 (100.00%)
    Investigations
    Blood bicarbonate decreased
         subjects affected / exposed
    0 / 8 (0.00%)
    2 / 12 (16.67%)
         occurrences all number
    0
    3
    Activated partial thromboplastin time prolonged
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Anticonvulsant drug level increased
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Blood cholesterol increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Blood creatine phosphokinase increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Blood triglycerides increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    C-reactive protein increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Electrocardiogram QT prolonged
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    2
    Electrocardiogram ST-T change
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Haematocrit increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    International normalised ratio increased
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Low density lipoprotein increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Oxygen saturation decreased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Neutrophil count decreased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Platelet count increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    White blood cell count increased
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Injury, poisoning and procedural complications
    Face injury
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Fall
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Nervous system disorders
    Seizure
         subjects affected / exposed
    2 / 8 (25.00%)
    1 / 12 (8.33%)
         occurrences all number
    2
    1
    Lethargy
         subjects affected / exposed
    2 / 8 (25.00%)
    0 / 12 (0.00%)
         occurrences all number
    2
    0
    Partial seizures
         subjects affected / exposed
    0 / 8 (0.00%)
    2 / 12 (16.67%)
         occurrences all number
    0
    3
    Tonic convulsion
         subjects affected / exposed
    0 / 8 (0.00%)
    2 / 12 (16.67%)
         occurrences all number
    0
    3
    Atonic seizures
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Balance disorder
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Hypersomnia
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Drooling
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Hypotonia
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Somnolence
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Tremor
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Blood and lymphatic system disorders
    Eosinophilia
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    General disorders and administration site conditions
    Fatigue
         subjects affected / exposed
    2 / 8 (25.00%)
    0 / 12 (0.00%)
         occurrences all number
    2
    0
    Asthenia
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Peripheral swelling
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Pain
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Immune system disorders
    Seasonal allergy
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Gastrointestinal disorders
    Constipation
         subjects affected / exposed
    0 / 8 (0.00%)
    4 / 12 (33.33%)
         occurrences all number
    0
    5
    Diarrhoea
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Frequent bowel movements
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Respiratory, thoracic and mediastinal disorders
    Apnoea
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Hyperventilation
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Pneumonia aspiration
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Skin and subcutaneous tissue disorders
    Rash
         subjects affected / exposed
    1 / 8 (12.50%)
    2 / 12 (16.67%)
         occurrences all number
    1
    2
    Pruritus
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Psychiatric disorders
    Agitation
         subjects affected / exposed
    1 / 8 (12.50%)
    1 / 12 (8.33%)
         occurrences all number
    1
    1
    Initial insomnia
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Irritability
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    2
    Sleep disorder
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    2
    Renal and urinary disorders
    Neurogenic bladder
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Urinary retention
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Infections and infestations
    Ear infection
         subjects affected / exposed
    0 / 8 (0.00%)
    2 / 12 (16.67%)
         occurrences all number
    0
    3
    Nasopharyngitis
         subjects affected / exposed
    1 / 8 (12.50%)
    1 / 12 (8.33%)
         occurrences all number
    1
    1
    Respiratory tract infection
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1
    Sinusitis
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Upper respiratory tract infection
         subjects affected / exposed
    1 / 8 (12.50%)
    0 / 12 (0.00%)
         occurrences all number
    1
    0
    Urinary tract infection
         subjects affected / exposed
    0 / 8 (0.00%)
    1 / 12 (8.33%)
         occurrences all number
    0
    1

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    31 Jan 2019
    The changes implemented based on Amendment 1 were: -Revised study design. -Updated name of titration period to Dose Optimization Period due to change in the length of the treatment period. -Revised the primary and secondary objectives/endpoints. -Added secondary objectives/endpoints. -Revised exploratory objectives. -One exploratory objective/endpoint was added. -Study visits were changed to reflect the revised study design. -Timepoints for collection of samples for pharmacokinetic analysis were clarified. -The age for participation was increased to 35 years. -Route of administration was expanded to include G-tube/PEG tube/J-tube at all sites except those in China. -Perampanel was added as a prohibited medication. -The use of traditional Chinese medicines was clarified. -Clarified and revised inclusion and exclusion criteria. -An optional severity assessment for cyclin-dependent kinase-like 5 (CDKL5) deficiency syndrome was added. -Handling of missed doses was clarified. -Requirement was added to discontinue a patient if he/she exhibits signs of suicidal ideation. -Cytochrome P450 (CYP) 46A1 mutation analysis was removed and replaced with optional blood sample storage for exploratory research.
    31 Jan 2019
    -Two additional timepoints were added for collection of plasma 24HC. -Amount of blood samples was changed to reflect additional visits. -Change in dose during the study was clarified. -Weight-based dosing was updated to reflect the administration of 100 mg tablets. -Use of an electroencephalogram (EEG) charter was removed. -An additional electrocardiogram (ECG) assessment was added. -Clarification was added for rolling over from the antecedent trial to the open-label extension. -Oxcarbazepine was added to the assay for concomitant antiepileptic drugs (AEDs). -An analysis population (Efficacy Analysis Population) was added. -Statistical analyses were revised. -Confidentiality of participant information was clarified. -The length of time participants must avoid pregnancy, donation of ova, and sperm donation after the last dose of study drug was clarified and instructions were included if urine cannot be collected at Visit 2. -End of study definition was added. -Description of the dosing card was added.
    20 Nov 2019
    The changes implemented based on Amendment 2 were: -Modified inclusion/exclusion criteria to increase the age for participation in the trial to 55 years old and expand the inclusion criteria to allow participants with a diagnosis of interstitial Dup15q. -Corrected an inadvertent error in the way the secondary endpoints CGI-S, CGI-C, and Care-CGI-C were defined, from “percent change” to “change”. -Added that Jejunostomy tube (J-tube) may be considered based on approval from Medical Monitor and Sponsor. -Allowed ad hoc analyses throughout the trial. -Added an additional subgroup in the treatment responder analysis (≥75% reduction in motor seizure frequency). -Made corrections in schedule of assessment table including, 1.Separated out CGI-S from CGI-C; 2.Removed collection seizure diary checks on Day 8, Day 22, Day 57, Day 113. -Removed the exploratory endpoint of EEG parameters in participants with Dup15q. -Removed the optional blood sample for research analysis.

    Interruptions (globally)

    Were there any global interruptions to the trial? No

    Limitations and caveats

    Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data.
    None reported
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