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    Clinical Trial Results:
    A Phase 3, 12-week, Double-Blind, Placebo-Controlled, Randomized, Multicenter Study to Evaulate the Efficacy of Oral Istradefylline 20 and 40 mg/day as Treatment for Subjects with Moderate to Severe Parkinson's Disease

    Summary
    EudraCT number
    2013-002254-70
    Trial protocol
    DE   IT   CZ   PL  
    Global end of trial date
    12 Oct 2016

    Results information
    Results version number
    v1(current)
    This version publication date
    14 Oct 2017
    First version publication date
    14 Oct 2017
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    6002-014
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT01968031
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    Kyowa Kirin Pharmaceutical Development, Inc.
    Sponsor organisation address
    212 Carnegie Center, Princeton, United States,
    Public contact
    Clinical Trial Help Desk, Kyowa Kirin Pharmaceutical Development, Inc., +1 888464-65747306, 6002014helpdesk@kyowakirin.com
    Scientific contact
    Clinical Trial Help Desk, Kyowa Kirin Pharmaceutical Development, Inc., +1 888464-65747306, 6002014helpdesk@kyowakirin.com
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    No
    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
    07 Aug 2017
    Is this the analysis of the primary completion data?
    Yes
    Primary completion date
    12 Oct 2016
    Global end of trial reached?
    Yes
    Global end of trial date
    12 Oct 2016
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    To establish the efficacy of istradefylline 20 and 40 mg/d for reducing the total hours of OFF time per day in moderate to severe PD patients with motor fluctuations and dyskinesia on levodopa combinations (levodopa/carbidopa and levodopa/benserazide) therapy.
    Protection of trial subjects
    The Principal Investigators were responsible for the conduct and administration of the study in accordance with the protocol and ICH E6-GCP (CPMP/ICH/135/95) guidelines, for collecting, recording, and reporting the data accurately and properly as well as compliance with 21 CFR Parts 11, 50, 54, 56, and 312 and the applicable country-specific requirements and in accordance with the ethical principles enunciated in the Declaration of Helsinki adopted by the 18th World Medical Association (WMA) General Assembly in Helsinki, Finland (June 1964); and amended most recently in 2013 (ninth revision). The Principal Investigator at each center was also responsible for contacts with study center management, the IEC/IRB, and with local non-regulatory bodies. Agreement of the Investigator to conduct and administer this study in accordance with the protocol was documented in separate study agreements with the Sponsor and other forms as required by national authorities in the country where the study center was located. The Investigator’s staff was responsible for preparing the study-specific written consent document for this study. The documents incorporated the required elements for informed consent, including the possible treatment risks and necessary documentation as required by the Declaration of Helsinki, 21 CFR Part 50, and the ICH-GCP (CPMP/ICH/135/95) guidelines. The ICF also was to contain any additional information required by local laws relating to IRB/IEC review. The ICF was approved by the IRB/IEC and the Sponsor. The subject’s willingness to participate in the study was documented in writing (signed and dated by the subject [or by the subject’s legally acceptable representative] and by the person who conducted the informed consent discussion) with a copy provided to the subject. The Investigators kept the original consent forms and copies were given to the subjects.
    Background therapy
    Subjects were on levodopa plus a dopa decarboxylase inhibitor. Subjects were also on at least one additional approved dopaminergic treatment for PD, at recommended doses.
    Evidence for comparator
    -
    Actual start date of recruitment
    31 Oct 2013
    Long term follow-up planned
    Yes
    Long term follow-up rationale
    Safety
    Long term follow-up duration
    12 Months
    Independent data monitoring committee (IDMC) involvement?
    No
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    Poland: 70
    Country: Number of subjects enrolled
    Czech Republic: 68
    Country: Number of subjects enrolled
    Germany: 45
    Country: Number of subjects enrolled
    Italy: 59
    Country: Number of subjects enrolled
    Canada: 33
    Country: Number of subjects enrolled
    Israel: 35
    Country: Number of subjects enrolled
    Serbia: 25
    Country: Number of subjects enrolled
    United States: 278
    Worldwide total number of subjects
    613
    EEA total number of subjects
    242
    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)
    0
    Adolescents (12-17 years)
    0
    Adults (18-64 years)
    313
    From 65 to 84 years
    297
    85 years and over
    3

    Subject disposition

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    Recruitment
    Recruitment details
    Recruitment opened in October 2013 and closed in July 2016.

    Pre-assignment
    Screening details
    All subjects were screened for eligibility to participate in the trial. Subjects that met all inclusion/exclusion criteria as per protocol, were eligible for entry into the trial. A total of 828 subjects were screened of which 215 failed the screening process. 613 subjects were therefore enrolled into the trial.

    Period 1
    Period 1 title
    Overall Trial (overall period)
    Is this the baseline period?
    Yes
    Allocation method
    Randomised - controlled
    Blinding used
    Double blind
    Roles blinded
    Subject, Investigator, Monitor, Data analyst, Carer, Assessor

    Arms
    Are arms mutually exclusive
    Yes

    Arm title
    Placebo
    Arm description
    -
    Arm type
    Placebo

    Investigational medicinal product name
    Placebo
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    Subjects were treated on an outpatient basis and instructed to take the assigned dose of study drug (placebo) in the morning with food; however, study drug was permitted to be taken without food if subjects did not routinely eat breakfast. There was no dose adjustment in this study.

    Arm title
    istradefylline 20 mg/d
    Arm description
    -
    Arm type
    Experimental

    Investigational medicinal product name
    istradefylline (KW-6002)
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    Subjects were treated on an outpatient basis and instructed to take the assigned dose of study drug (20 mg/d) in the morning with food; however, study drug was permitted to be taken without food if subjects did not routinely eat breakfast. There was no dose adjustment in this study.

    Arm title
    istradefylline 40 mg/d
    Arm description
    -
    Arm type
    Experimental

    Investigational medicinal product name
    istradefylline (KW-6002)
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    Subjects were treated on an outpatient basis and instructed to take the assigned dose of study drug (40 mg/d) in the morning with food; however, study drug was permitted to be taken without food if subjects did not routinely eat breakfast. There was no dose adjustment in this study.

    Number of subjects in period 1
    Placebo istradefylline 20 mg/d istradefylline 40 mg/d
    Started
    204
    202
    207
    Completed
    186
    182
    178
    Not completed
    18
    20
    29
         Adverse event, serious fatal
    -
    -
    1
         Consent withdrawn by subject
    3
    7
    3
         Failed inclusion criteria. Never received IMP
    -
    1
    -
         Adverse event, non-fatal
    13
    10
    22
         Not enough OFF time during baseline diary review
    -
    1
    -
         Protocol deviation
    2
    1
    3

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Placebo
    Reporting group description
    -

    Reporting group title
    istradefylline 20 mg/d
    Reporting group description
    -

    Reporting group title
    istradefylline 40 mg/d
    Reporting group description
    -

    Reporting group values
    Placebo istradefylline 20 mg/d istradefylline 40 mg/d Total
    Number of subjects
    204 202 207 613
    Age categorical
    Units: Subjects
        In utero
    0 0 0 0
        Preterm newborn infants (gestational age < 37 wks)
    0 0 0 0
        Newborns (0-27 days)
    0 0 0 0
        Infants and toddlers (28 days-23 months)
    0 0 0 0
        Children (2-11 years)
    0 0 0 0
        Adolescents (12-17 years)
    0 0 0 0
        Adults (18-64 years)
    104 108 101 313
        From 65-84 years
    99 93 105 297
        85 years and over
    1 1 1 3
    Age continuous
    Units: years
        arithmetic mean (full range (min-max))
    63.8 (41 to 86) 63.6 (41 to 87) 64.5 (40 to 85) -
    Gender categorical
    Units: Subjects
        Female
    80 77 81 238
        Male
    124 125 126 375

    End points

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    End points reporting groups
    Reporting group title
    Placebo
    Reporting group description
    -

    Reporting group title
    istradefylline 20 mg/d
    Reporting group description
    -

    Reporting group title
    istradefylline 40 mg/d
    Reporting group description
    -

    Primary: Change from baseline in the total hours of awake time per day spent in the OFF state

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    End point title
    Change from baseline in the total hours of awake time per day spent in the OFF state
    End point description
    End point type
    Primary
    End point timeframe
    Total hours of awake time/day spent in the OFF state were measured at Baseline and Week 12 for the Primary Efficacy Endpoint
    End point values
    Placebo istradefylline 20 mg/d istradefylline 40 mg/d
    Number of subjects analysed
    198
    194
    200
    Units: Hours
        least squares mean (confidence interval 95%)
    -0.88 (-1.19 to -0.58)
    -1.2 (-1.52 to -0.89)
    -1.15 (-1.46 to -0.84)
    Statistical analysis title
    Primary Efficacy Endpoint Statistical Analysis
    Comparison groups
    Placebo v istradefylline 20 mg/d v istradefylline 40 mg/d
    Number of subjects included in analysis
    592
    Analysis specification
    Pre-specified
    Analysis type
    superiority
    P-value
    ≤ 0.05
    Method
    Mixed Model Repeated Measures
    Parameter type
    LS Mean Difference
    Point estimate
    -0.27
    Confidence interval
         level
    95%
         sides
    2-sided
         lower limit
    -0.7
         upper limit
    0.17

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    Subjects were monitored for any untoward medical occurrences from the time of signed Informed Consent through 30 days post dose.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    16.1
    Reporting groups
    Reporting group title
    Placebo
    Reporting group description
    -

    Reporting group title
    istradefylline 20 mg/d
    Reporting group description
    -

    Reporting group title
    istradefylline 40 mg/d
    Reporting group description
    -

    Serious adverse events
    Placebo istradefylline 20 mg/d istradefylline 40 mg/d
    Total subjects affected by serious adverse events
         subjects affected / exposed
    7 / 204 (3.43%)
    6 / 201 (2.99%)
    8 / 207 (3.86%)
         number of deaths (all causes)
    0
    0
    1
         number of deaths resulting from adverse events
    0
    0
    0
    Investigations
    Alanine aminotransferase increased
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Aspartate aminotransferase increased
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Blood creatine phosphokinase increased
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Blood lactate dehydrogenase increased
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Medical observation
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Injury, poisoning and procedural complications
    Anaesthetic complication neurological
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Thoracic vertebral fracture
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Cardiac disorders
    Angina pectoris
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Cardiac failure acute
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
    Cardiac failure congestive
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    1 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Mitral valve incompetence
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Mitral valve prolapse
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Nervous system disorders
    Parkinson's disease
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    General disorders and administration site conditions
    Fatigue
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Oedema
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    1 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Ear and labyrinth disorders
    Vertigo
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Gastrointestinal disorders
    Constipation
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Inguinal hernia, obstructive
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Intestinal obstruction
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Nausea
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Pancreatitis
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Umbilical hernia
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Skin and subcutaneous tissue disorders
    Skin ulcer
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Psychiatric disorders
    Confusional state
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    1 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Delirium
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Musculoskeletal and connective tissue disorders
    Arthritis
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Infections and infestations
    Bacteraemia
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Clostridium difficile colitis
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Infectious pleural effusion
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Peritonitis
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Pneumonia
         subjects affected / exposed
    1 / 204 (0.49%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    1 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Sepsis syndrome
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Septic shock
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Wound infection
         subjects affected / exposed
    0 / 204 (0.00%)
    0 / 201 (0.00%)
    1 / 207 (0.48%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Metabolism and nutrition disorders
    Hyponatraemia
         subjects affected / exposed
    0 / 204 (0.00%)
    1 / 201 (0.50%)
    0 / 207 (0.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Placebo istradefylline 20 mg/d istradefylline 40 mg/d
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    111 / 204 (54.41%)
    117 / 201 (58.21%)
    132 / 207 (63.77%)
    Injury, poisoning and procedural complications
    Fall
         subjects affected / exposed
    9 / 204 (4.41%)
    13 / 201 (6.47%)
    18 / 207 (8.70%)
         occurrences all number
    12
    17
    22
    Nervous system disorders
    Dyskinesia
         subjects affected / exposed
    14 / 204 (6.86%)
    23 / 201 (11.44%)
    34 / 207 (16.43%)
         occurrences all number
    14
    30
    37
    Gastrointestinal disorders
    Nausea
         subjects affected / exposed
    2 / 204 (0.98%)
    8 / 201 (3.98%)
    12 / 207 (5.80%)
         occurrences all number
    2
    8
    13

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    12 Jul 2013
    1) Subject Selection and the Inclusion Criteria were updated to remove all references to “intolerance” as related to levodopa or the class of antiparkinsonian medications. Inclusion criteria 5 and 7 have been combined to include subjects who are currently taking levodopa combinations (carbidopa/levodopa or benserazide/levodopa) with a total daily levodopa dosage of at least 400 mg plus a recommended, clinically effective dose of at least one adjunctive medication approved to treat Parkinson’s disease such as a dopamine agonist, MAO-B inhibitor, or COMT inhibitor taken at the recommended dosages listed in the country-approved label for at least 2 weeks prior to randomization. (Note that subjects treated with anticholinergic medications or amantadine alone are not considered adequately treated with adjunctive antiparkinsonian medications and cannot be enrolled). 2) The Inclusion Criterion number 12 was updated to include subjects who are experiencing significant motor fluctuations while receiving levodopa plus adjunctive medication(s) as defined by an average of at least 2 hours OFF time on the three 24-hour ON/OFF patient diaries prior to the Baseline visit. 3) Flowchart of Study Procedures was updated to add footnote “f” to ensure that the inclusion criteria are reviewed to verify that subjects are experiencing significant motor fluctuations while receiving levodopa plus adjunctive medication(s) at Baseline. 4) The Baseline, Day 1 procedures were updated to specify that the three 24-hour patient diaries completed on 3 consecutive days immediately prior to the Baseline Day 1 visit will be reviewed to confirm that subjects are still experiencing significant motor fluctuations while receiving levodopa plus adjunctive medication(s). 5) Throughout the protocol, levodopa/carbidopa was updated to levodopa combinations (defined as levodopa/carbidopa or benserazide/levodopa).
    29 Jul 2013
    1) The Exclusion Criteria number 16 was updated to exclude subjects with mild, moderate, or severe hepatic impairment based upon Child-Pugh categorization of A, B, or C. Coagulation parameters were added to Table 9.3.2-1 Clinical Laboratory Assessments, and Appendix 9 was added with the Child-Pugh Categorization of the Severity of Liver Disease. 2) All references throughout the protocol to the QUIP scale have been updated to the QUIP-RS, including Appendix 12. 3) Text was added to Table 9.1-1 Study Schedule of Events, the PK Sampling Times Section, the Serious Adverse Events Section, and the Other Safety Considerations to instruct sites to attempt to collect a PK blood sample when SAEs occur. 4) Domperidone was indicated as an excluded medication in Section 8.1. In addition, Exclusion Criterion number 1 was updated to delete: (atypical dopamine antagonists [if approved in the country] are allowed).
    26 Sep 2013
    1) Adverse Event Contacts: Change in personnel noted. 2) Synopsis and protocol body: Correction of levodopa/carbidopa to levodopa combination (levodopa/carbidopa or benserazide/levodopa) therapy, as applicable. 3) Synopsis and Section 5.2: Update the approximate number of sites to 95. 4) Section 3.3 Nonclinical Overview: Wording was updated to clarify the nonclinical program results. 5) Section 7.5 and Table 9.1-1 Study Schedule of Events (footnote “d”): Clarification was made to add that the telephone contact will be made 30 days (± 7 days) “after the last dose of study drug” as follow-up for those subjects who discontinue prematurely from the study. 6) Section 9.2.2 Baseline Visit: Clarified wording to ensure that subjects will take the first dose of study drug at the Investigator’s office and take the next dose of study drug the next morning (Day 2). In addition, the procedures done at the baseline visit were reordered to clarify how they are to occur. 7) Section 9.2.3 was updated to clarify that the three 24-hour patient diaries are to be completed on 3 consecutive days immediately prior to the scheduled visit. In addition, text was added to specify that the sites will instruct subjects not to take the study drug on the day of each clinic visit. 8) Section 9.3.2.3: was updated in the section describing orthostatic measurements to include heart rate (HR) where it was previously inadvertently omitted. 9) Other administrative, personnel changes, and correction of typographical and grammatical errors were made where needed.
    15 Aug 2016
    The purpose of this protocol amendment was to align the statistical wording with relevant changes as determined by amendments to the original Statistical Analysis Plan in follow-up to further dialogue with FDA.

    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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