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    Clinical Trial Results:
    A Switch-Over, Open-Label Study of the Safety, Pharmacokinetics, and Efficacy of HPN-100, Followed by Long-Term Treatment with HPN-100, in Pediatric Subjects under 6 Years of Age with Urea Cycle Disorders (UCDs)

    Summary
    EudraCT number
    2014-003248-12
    Trial protocol
    Outside EU/EEA  
    Global end of trial date
    02 Dec 2011

    Results information
    Results version number
    v1(current)
    This version publication date
    06 Jul 2016
    First version publication date
    06 Jul 2016
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    HPN-100-012
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT01347073
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    Horizon Therapeutics Inc.
    Sponsor organisation address
    150 S. Saunders Road, Lake Forest, United States, 60045
    Public contact
    Elizabeth Robinson, Horizon Therapeutics Inc., clinicaltrials@horizonpharma.com
    Scientific contact
    Tom Vescio, Horizon Therapeutics Inc., clinicaltrials@horizonpharma.com
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    Yes
    EMA paediatric investigation plan number(s)
    EMEA-000297-PIP02-12
    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?
    Yes
    Results analysis stage
    Analysis stage
    Final
    Date of interim/final analysis
    02 Dec 2011
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    02 Dec 2011
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    This non-randomized, open-label study was approximately one year in duration and consisted of a short term sodium phenylbutyrate (NaPBA) to glycerol phenylbutyrate (HPN-100) switch-over part (EudraCT #2014-003248-12) involving two overnight stays followed by a 12-month long term treatment period (EudraCT #2014-003249-82) involving monthly visits. The objectives of this study were to assess safety, pharmacokinetics, and ammonia control during treatment with HPN-100 in pediatric subjects (aged 29 days to < 6 years) with UCDs.
    Protection of trial subjects
    The protocol and consent/assent forms were submitted by each investigator to an Independent Ethics Committee (IEC) or Institutional Review Board (IRB) for review and approval before study initiation. The study was conducted in accordance with legal and regulatory requirements including Guidance for Good Clinical Practice (International Conference on Harmonization [ICH] 1996), and the Declaration of Helsinki (World Medical Association 2008). Only subjects who met the inclusion criteria and none of the exclusion criteria were enrolled to this study. Written informed consent was to be obtained from the subject’s legally acceptable representative and assent by the minor subject, as applicable, before screening or baseline assessments. Instructions were given to the subject's legally acceptable representative in case of emergency or other questions.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    09 Sep 2011
    Long term follow-up planned
    No
    Independent data monitoring committee (IDMC) involvement?
    Yes
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    United States: 15
    Worldwide total number of subjects
    15
    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)
    4
    Children (2-11 years)
    11
    Adolescents (12-17 years)
    0
    Adults (18-64 years)
    0
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    Study Locations: Houston, TX; Minneapolis, MN; Washington, DC; New York, NY; Cleveland, OH; Portland, ME; Portland, OR Study Initiation Date: September 9, 2011 Study Completion Date: December 2, 2011

    Pre-assignment
    Screening details
    Subjects eligible for this study included children aged 29 days to < 6 years with either a diagnosed or clinically suspected UCD who were receiving a stable dose of the powder formulation of NaPBA.

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

    Arms
    Are arms mutually exclusive
    No

    Arm title
    HPN-100
    Arm description
    On Day 2 of the study, subjects were switched from NaPBA to HPN-100 in an inpatient setting. Subjects were discharged once the investigator deemed them to be clinically controlled on HPN-100. After receiving all of their PBA in the form of HPN-100 for at least 4 days and at the end of the 10-day switch-over phase, subjects may have continued in the long-term follow-up treatment phase with HPN-100 for up to 12 months.
    Arm type
    Experimental

    Investigational medicinal product name
    glycerol phenylbutyrate
    Investigational medicinal product code
    HPN-100
    Other name
    Pharmaceutical forms
    Oral liquid
    Routes of administration
    Oral use
    Dosage and administration details
    HPN-100 was to be administered just prior to breastfeeding or administration of formula or food. The maximum recommended dose of HPN-100 in subjects weighing less than 20 kg is 0.52 mL/kg/day (equivalent to 600 mg/kg/day of NaPBA), and is 11.48 mL/m2/day in heavier subjects (equivalent to 13 g/m2/day of NaPBA). The maximum total daily HPN-100 dose allowed is 17.4 mL/day, which is approximately equivalent to 20 g/day of NaPBA.

    Arm title
    NaPBA
    Arm description
    On Day 1, subjects were observed for at least 24 hours while receiving NaPBA and underwent serial blood draws before being switched to HPN-100 in an inpatient setting.
    Arm type
    Experimental

    Investigational medicinal product name
    sodium phenylbutyrate
    Investigational medicinal product code
    NaPBA
    Other name
    AMMONAPS
    Pharmaceutical forms
    Powder and solvent for oral solution, Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    NaBPA was to be administered orally at the dose levels recommended in the prescribing information, 450 to 600 mg/kg per day for subjects weighing less than 20 kg, or 9.9 to 13 g/m2 per day for larger subjects. In clinical practice, the dose of NaPBA is individualized based on the severity of the enzyme deficiency, diet, and other factors.

    Number of subjects in period 1
    HPN-100 NaPBA
    Started
    15
    15
    Completed
    15
    15

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Overall Study
    Reporting group description
    -

    Reporting group values
    Overall Study Total
    Number of subjects
    15 15
    Age Categorical
    Units: participants
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    2.87 ( 1.885 ) -
    Gender, Male/Female
    Units: participants
        Female
    7 7
        Male
    8 8

    End points

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    End points reporting groups
    Reporting group title
    HPN-100
    Reporting group description
    On Day 2 of the study, subjects were switched from NaPBA to HPN-100 in an inpatient setting. Subjects were discharged once the investigator deemed them to be clinically controlled on HPN-100. After receiving all of their PBA in the form of HPN-100 for at least 4 days and at the end of the 10-day switch-over phase, subjects may have continued in the long-term follow-up treatment phase with HPN-100 for up to 12 months.

    Reporting group title
    NaPBA
    Reporting group description
    On Day 1, subjects were observed for at least 24 hours while receiving NaPBA and underwent serial blood draws before being switched to HPN-100 in an inpatient setting.

    Primary: Number of Subjects With Treatment-Emergent Adverse Events

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    End point title
    Number of Subjects With Treatment-Emergent Adverse Events [1]
    End point description
    Number of subjects with treatment-emergent adverse events during the switch-over portion of the protocol.
    End point type
    Primary
    End point timeframe
    2 weeks
    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: Data are summarized for this endpoint per protocol.
    End point values
    HPN-100 NaPBA
    Number of subjects analysed
    15
    15
    Units: subjects
        number (not applicable)
    6
    0
    No statistical analyses for this end point

    Secondary: HPN-100-012 Blood Ammonia Area Under the Curve (AUC) by Treatment During the Switch-over

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    End point title
    HPN-100-012 Blood Ammonia Area Under the Curve (AUC) by Treatment During the Switch-over
    End point description
    24-hour ammonia AUC of blood ammonia levels on Days 1 (NaPBA) and 10 (HPN-100) were compared.
    End point type
    Secondary
    End point timeframe
    Day 1 and Day 10: Hour 0 (pre-first dose, fasted), Hour 8 (~2-4 hours after lunch or the second main meal and dose of NaPBA or HPN-100), Hour 12 (~4 hours after the last main meal) and 24 hours post-first dose (pre-first dose on following day, fasted).
    End point values
    HPN-100 NaPBA
    Number of subjects analysed
    13
    15
    Units: umol/L*hours
        arithmetic mean (standard deviation)
    647.63 ( 379.944 )
    914.43 ( 630.206 )
    No statistical analyses for this end point

    Secondary: Frequency of Ammonia Levels Greater Than the Upper Limit of Normal (ULN) on HPN-100 Compared With NaPBA

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    End point title
    Frequency of Ammonia Levels Greater Than the Upper Limit of Normal (ULN) on HPN-100 Compared With NaPBA
    End point description
    Ammonia values were converted to SI units (umol/L) and normalized to a standard ULN of 35 umol/L prior to analysis.
    End point type
    Secondary
    End point timeframe
    2 weeks
    End point values
    HPN-100 NaPBA
    Number of subjects analysed
    15 [2]
    15 [3]
    Units: Ammonia Values > ULN
        number (not applicable)
    8
    22
    Notes
    [2] - number of ammonia values analyzed=53
    [3] - number of ammonia values analyzed=58
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    Up to Day 10
    Adverse event reporting additional description
    Treatment-emergent adverse events are presented.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    12.1
    Reporting groups
    Reporting group title
    HPN-100
    Reporting group description
    On Day 2 of the study, subjects were switched from NaPBA to HPN-100 in an inpatient setting. Subjects were discharged once the investigator deemed them to be clinically controlled on HPN-100. After receiving all of their PBA in the form of HPN-100 for at least 4 days and at the end of the 10-day switch-over phase, subjects may have continued in the long-term follow-up treatment phase with HPN-100 for up to 12 months.

    Reporting group title
    NaPBA
    Reporting group description
    On Day 1, subjects were observed for at least 24 hours while receiving NaPBA and underwent serial blood draws before being switched to HPN-100 in an inpatient setting.

    Serious adverse events
    HPN-100 NaPBA
    Total subjects affected by serious adverse events
         subjects affected / exposed
    0 / 15 (0.00%)
    0 / 15 (0.00%)
         number of deaths (all causes)
    0
    0
         number of deaths resulting from adverse events
    Frequency threshold for reporting non-serious adverse events: 0%
    Non-serious adverse events
    HPN-100 NaPBA
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    6 / 15 (40.00%)
    0 / 15 (0.00%)
    Investigations
    Cardiac murmur
         subjects affected / exposed
    1 / 15 (6.67%)
    0 / 15 (0.00%)
         occurrences all number
    1
    0
    Blood and lymphatic system disorders
    Lymphadenopathy
         subjects affected / exposed
    1 / 15 (6.67%)
    0 / 15 (0.00%)
         occurrences all number
    1
    0
    Gastrointestinal disorders
    Vomiting
         subjects affected / exposed
    2 / 15 (13.33%)
    0 / 15 (0.00%)
         occurrences all number
    2
    0
    Flatulence
         subjects affected / exposed
    1 / 15 (6.67%)
    0 / 15 (0.00%)
         occurrences all number
    1
    0
    Skin and subcutaneous tissue disorders
    Rash papular
         subjects affected / exposed
    1 / 15 (6.67%)
    0 / 15 (0.00%)
         occurrences all number
    1
    0

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? No

    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.
    The protocol was designed to capture information important for evaluating safety, pharmacokinetics, and efficacy while recognizing sampling limitations in young children and current standard of care.
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    The status and protocol content of GB trials is no longer updated since 1 January 2021. For the UK, as of 31 January 2021, EU Law applies only to the territory of Northern Ireland (NI) to the extent foreseen in the Protocol on Ireland/NI. Legal notice
    As of 31 January 2023, all EU/EEA initial clinical trial applications must be submitted through CTIS . Updated EudraCT trials information and information on PIP/Art 46 trials conducted exclusively in third countries continues to be submitted through EudraCT and published on this website.

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