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    Clinical Trial Results:
    A LONG-TERM, OPEN-LABEL STUDY TO EVALUATE THE SAFETY, PHARMACODYNAMICS, AND EFFICACY OF MIGALASTAT IN SUBJECTS > 12 YEARS OF AGE WITH FABRY DISEASE AND AMENABLE GLA VARIANTS

    Summary
    EudraCT number
    2019-000222-21
    Trial protocol
    GB  
    Global end of trial date
    29 Nov 2024

    Results information
    Results version number
    v1(current)
    This version publication date
    06 Jun 2025
    First version publication date
    06 Jun 2025
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    AT1001-036
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT04049760
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    Amicus Therapeutics UK Limited
    Sponsor organisation address
    One Globeside, Fieldhouse Lane, Marlow, United Kingdom,
    Public contact
    Patient Advocacy, Amicus Therapeutics, Inc., 001 609662-2000, clinicaltrials@amicusrx.com
    Scientific contact
    Patient Advocacy, Amicus Therapeutics, Inc., 001 609662-2000, clinicaltrials@amicusrx.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?
    Yes
    Results analysis stage
    Analysis stage
    Final
    Date of interim/final analysis
    16 Apr 2025
    Is this the analysis of the primary completion data?
    Yes
    Primary completion date
    29 Nov 2024
    Global end of trial reached?
    Yes
    Global end of trial date
    29 Nov 2024
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    The primary objective was to assess the long-term safety of migalastat treatment in adolescent subjects diagnosed with Fabry disease who had variants in the gene encoding α-galactosidase A (α-Gal A) (GLA) amenable to treatment with migalastat
    Protection of trial subjects
    Subjects enrolled in this study following the completion of migalastat Study AT1001-020. Enrollment into Study AT1001-036 immediately followed the completion of Study AT1001-020 in order to maintain continuity of treatment. Efficacy and safety assessments planned and performed in this study were standard, widely used and generally recognized as reliable, accurate, and relevant.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    11 Oct 2019
    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 Kingdom: 4
    Country: Number of subjects enrolled
    United States: 12
    Worldwide total number of subjects
    16
    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)
    0
    Adolescents (12-17 years)
    16
    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
    -

    Pre-assignment
    Screening details
    Subjects enrolled into this long-term open-label extension study immediately following the completion of Study AT1001-020. Subjects continued in Study AT1001-036 until eligible to receive reimbursed commercial product in the participating subject’s country.

    Pre-assignment period milestones
    Number of subjects started
    16
    Number of subjects completed
    16

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

    Arms
    Arm title
    Migalastat
    Arm description
    migalastat HCl 150 mg QOD
    Arm type
    Experimental

    Investigational medicinal product name
    Migalastat HCl
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Capsule, hard
    Routes of administration
    Oral use
    Dosage and administration details
    migalastat HCl 150 mg once every other day (QOD)

    Number of subjects in period 1
    Migalastat
    Started
    16
    Completed
    15
    Not completed
    1
         Consent withdrawn by subject
    1

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Migalastat
    Reporting group description
    migalastat HCl 150 mg QOD

    Reporting group values
    Migalastat Total
    Number of subjects
    16 16
    Age categorical
    Units: Subjects
        In utero
    0 0
        Preterm newborn infants (gestational age < 37 wks)
    0 0
        Newborns (0-27 days)
    0 0
        Infants and toddlers (28 days-23 months)
    0 0
        Children (2-11 years)
    0 0
        Adults (18-64 years)
    0 0
        From 65-84 years
    0 0
        85 years and over
    0 0
        Adolescents (12- < 18 years)
    16 16
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    15.3 ( 1.49 ) -
    Gender categorical
    Units: Subjects
        Female
    6 6
        Male
    10 10
    Prior Enzyme Replacement Therapy (ERT) Status
    Units: Subjects
        ERT naive
    8 8
        ERT experienced
    8 8
    Years since Diagnosis of Fabry disease
    Units: Years
        arithmetic mean (standard deviation)
    10.79 ( 4.104 ) -

    End points

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    End points reporting groups
    Reporting group title
    Migalastat
    Reporting group description
    migalastat HCl 150 mg QOD

    Primary: Incidence of Treatment-emergent Adverse Events (TEAEs), Serious Adverse Events (SAEs), and Adverse Events (AEs) Leading to Discontinuation of Study Drug

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    End point title
    Incidence of Treatment-emergent Adverse Events (TEAEs), Serious Adverse Events (SAEs), and Adverse Events (AEs) Leading to Discontinuation of Study Drug [1]
    End point description
    Number of subjects with TEAE, SAE, and AE leading to discontinuation during the study period
    End point type
    Primary
    End point timeframe
    Entire study
    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: No statistical analyses performed on safety data in this open-label long-term extension study
    End point values
    Migalastat
    Number of subjects analysed
    16
    Units: Number of subjects
        Subjects with TEAEs
    13
        Subjects with SAEs
    1
        Subjects with AE leading to discontinuation
    0
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in estimated glomerular filtration rate (eGFR)

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    End point title
    Change from baseline to Month 24 in estimated glomerular filtration rate (eGFR)
    End point description
    Estimated GFR was calculated using the modified Schwartz formula according to the standards of the central laboratory.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    8 [2]
    Units: mL/min x 1.73 m2
        arithmetic mean (standard deviation)
    -27.6 ( 8.88 )
    Notes
    [2] - 8 subjects had eGFR calculated at Month 24 visit
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in urine protein

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    End point title
    Change from baseline to Month 24 in urine protein
    End point description
    Renal function was assessed by urine protein levels (mg/L). Urine samples were collected as part of urinalysis.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    7 [3]
    Units: mg/L
        arithmetic mean (standard deviation)
    38.6 ( 79.03 )
    Notes
    [3] - 7 subjects had urine protein result at Month 24
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in urine albumin

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    End point title
    Change from baseline to Month 24 in urine albumin
    End point description
    Renal function was assessed by urine albumin levels (mg/L). Urine samples were collected as part of urinalysis.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    6 [4]
    Units: mg/L
        arithmetic mean (standard deviation)
    -12.7 ( 21.73 )
    Notes
    [4] - 6 subjects had urine albumin result at Month 24
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in left ventricular mass index (LVMi)

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    End point title
    Change from baseline to Month 24 in left ventricular mass index (LVMi)
    End point description
    LVMi was assessed as a measure of cardiac impairment in the study participants. LVMi values for both M-mode and 2D-mode views are presented.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    8 [5]
    Units: g/m2
    arithmetic mean (standard deviation)
        2D-mode View
    4.75 ( 16.679 )
        M-mode view
    6.01 ( 9.014 )
    Notes
    [5] - 8 subjects had LVMi results at Month 24
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in Pediatric Quality of Life (PedsQL) scores

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    End point title
    Change from baseline to Month 24 in Pediatric Quality of Life (PedsQL) scores
    End point description
    The Pediatric Quality of Life Inventory (PedsQL) was a modular approach to measuring health-related quality of life in healthy children and adolescents and those with acute and chronic health conditions. All components of the PedsQL were scored based on a scale of 0 (never) to 4 (almost always) and linearly transformed to a 0 to 100 scale as follows: 0 = 100, 1 = 75, 2 = 50, 3 = 25, 4 = 0. Psychosocial, physical, and total scores were calculated based on the response to the questions within the patient reported outcome. The psychosocial score for the PedsQL encompassed 15 questions relating to the subjects’ feelings, social interaction with others, and school. The physical score was derived from answers to 8 questions about the subjects’ ease of managing physical activity. Total scores were the sum of all the item scores over the number of items answered on all the scales. Change from baseline values of < 0 represents worsening, 0 equals no change, and > 0 represents improvement.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    8 [6]
    Units: score on a scale
    median (full range (min-max))
        Psychosocial Score
    0 (-10 to 28)
        Physical Score
    0 (-19 to 19)
        Total Score
    -1.1 (-9 to 25)
    Notes
    [6] - 8 subjects had PedsQL results at Month 24
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in Fabry-specific Health and Pain Questionnaire (FPHPQ) Score for Pain Intensity

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    End point title
    Change from baseline to Month 24 in Fabry-specific Health and Pain Questionnaire (FPHPQ) Score for Pain Intensity
    End point description
    The Fabry-specific Pediatric Health and Pain Questionnaire (FPHPQ) included questions about Fabry disease-specific symptoms. The assessment of “How bad is your pain today?” was measured on a 10-point scale from 0 (no pain) to 10 (pain as bad as you can imagine). A decrease from baseline indicates an improvement in the condition.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    8 [7]
    Units: units on a scale
        arithmetic mean (standard deviation)
    -1.3 ( 3.20 )
    Notes
    [7] - 8 subjects completed the FPHPQ pain assessment at Month 24
    No statistical analyses for this end point

    Secondary: Number of Subjects Who Experienced Sudden Onset of Pain As Assessed Using the Fabry-specific Health and Pain Questionnaire (FPHPQ)

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    End point title
    Number of Subjects Who Experienced Sudden Onset of Pain As Assessed Using the Fabry-specific Health and Pain Questionnaire (FPHPQ)
    End point description
    Subjects were asked “In the last 3 months how many times did you experience sudden onset of pain?” and responses were reported in the FPHPQ. Responses were categorized as 0, 1 to 3, 4 to 6, and > 6 occurrences of sudden onset of pain.
    End point type
    Secondary
    End point timeframe
    Month 24
    End point values
    Migalastat
    Number of subjects analysed
    8 [8]
    Units: Subjects
        0 occurrences
    3
        1 to 3 occurrences
    4
        4 to 6 occurrences
    0
        >6 occurrences
    1
    Notes
    [8] - 8 subjects reported frequency of sudden onset of pain on FPHPQ at Month 24
    No statistical analyses for this end point

    Secondary: Change from baseline to Month 24 in plasma levels of lyso-Gb3

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    End point title
    Change from baseline to Month 24 in plasma levels of lyso-Gb3
    End point description
    Blood samples were collected for measurement of lyso-Gb3 levels in plasma. Plasma levels of lyso-Gb3 were measured using a validated liquid chromatography-mass spectrometry assay.
    End point type
    Secondary
    End point timeframe
    Baseline, Month 24
    End point values
    Migalastat
    Number of subjects analysed
    8 [9]
    Units: ng/mL
        arithmetic mean (standard deviation)
    0.05 ( 1.127 )
    Notes
    [9] - 8 subjects had lyso-Gb3 result at Month 24
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    Treatment period
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    27.0
    Reporting groups
    Reporting group title
    Migalastat
    Reporting group description
    -

    Serious adverse events
    Migalastat
    Total subjects affected by serious adverse events
         subjects affected / exposed
    1 / 16 (6.25%)
         number of deaths (all causes)
    0
         number of deaths resulting from adverse events
    0
    Infections and infestations
    Gastroenteritis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Migalastat
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    13 / 16 (81.25%)
    Neoplasms benign, malignant and unspecified (incl cysts and polyps)
    skin papilloma
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Vascular disorders
    Raynaud's phenomenon
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    General disorders and administration site conditions
    asthenia
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    2
    fatigue
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    pain
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    pyrexia
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Respiratory, thoracic and mediastinal disorders
    cough
         subjects affected / exposed
    2 / 16 (12.50%)
         occurrences all number
    2
    rhinorrhoea
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Investigations
    aspartate aminotransferase increased
         subjects affected / exposed
    3 / 16 (18.75%)
         occurrences all number
    3
    blood bilirubin increased
         subjects affected / exposed
    2 / 16 (12.50%)
         occurrences all number
    2
    alanine aminotransferase increased
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    blood alkaline phosphatase increased
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    electrocardiogram T wave biphasic
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    left ventricular mass index
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    weight increased
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Injury, poisoning and procedural complications
    contusion
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    road traffic accident
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    skin laceration
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    vaccination complication
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Cardiac disorders
    atrioventricular block first degree
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    left ventricular hypertrophy
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Nervous system disorders
    dizziness
         subjects affected / exposed
    3 / 16 (18.75%)
         occurrences all number
    3
    paraesthesia
         subjects affected / exposed
    2 / 16 (12.50%)
         occurrences all number
    2
    Gastrointestinal disorders
    diarrhoea
         subjects affected / exposed
    2 / 16 (12.50%)
         occurrences all number
    2
    abdominal pain upper
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    haematemesis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    impaired gastric emptying
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    tooth impacted
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    toothache
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    vomiting
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Hepatobiliary disorders
    hepatic steatosis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Skin and subcutaneous tissue disorders
    acne
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    dermatitis contact
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    ingrowing nail
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Renal and urinary disorders
    haematuria
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    pollakiuria
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    renal pain
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Musculoskeletal and connective tissue disorders
    back pain
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    Infections and infestations
    COVID-19
         subjects affected / exposed
    3 / 16 (18.75%)
         occurrences all number
    6
    nasopharyngitis
         subjects affected / exposed
    3 / 16 (18.75%)
         occurrences all number
    3
    acute sinusitis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    anal abscess
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    bronchitis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    ear infection
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    2
    influenza
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    laryngitis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    paronychia
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    pharyngitis streptococcal
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    sinusitis
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    upper respiratory tract infection
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    4
    Metabolism and nutrition disorders
    decreased appetite
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1
    obesity
         subjects affected / exposed
    1 / 16 (6.25%)
         occurrences all number
    1

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    24 Jun 2019
    • References to the Screening Visit were corrected to Baseline Visit since the extension study utilizes the last visit of a feeder study as baseline without the need for re-screening subjects. • New text introduced to cover the contingency of a weight decrease below the requirement for the study treatment dose. • Use of concomitant medications removed as a safety criterion. • A Data Monitoring Committee was considered to be unnecessary in light of the safety profile of migalastat. • Clarification of definitions for non-reproductive potential and acceptable birth control methods. • Deletion of FPHPQ and PedsQL collection at Month 1 visit since that time point was conducted via telephone contact.
    19 Aug 2021
    • Visit schedule changed from every 3 months to every 6 months, with intervening telephone contact every 3 months. • Removal of brief physical examinations from assessments to be performed due to change in visit schedule.

    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
    For support, Contact us.
    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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