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    Clinical Trial Results:
    An Open-Label, Safety Study for Previously Treated Vatiquinone (PTC743) Subjects With Inherited Mitochondrial Disease

    Summary
    EudraCT number
    2022-000375-39
    Trial protocol
    IT   ES   FR   SE   PL  
    Global end of trial date
    15 Apr 2025

    Results information
    Results version number
    v1(current)
    This version publication date
    05 Nov 2025
    First version publication date
    05 Nov 2025
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    PTC743-CNS-005-LSEP
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT05218655
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    PTC Therapeutics, Inc.
    Sponsor organisation address
    500 Warren Corp Centre Dr, Warren, United States, NJ 07059
    Public contact
    Medical Information, PTC Therapeutics, Inc., +011 44 1-866-562-4620, medinfo@ptcbio.com
    Scientific contact
    Medical Information, PTC Therapeutics International Limited, +353 19068700, medinfo@ptcbio.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
    09 Jun 2025
    Is this the analysis of the primary completion data?
    Yes
    Primary completion date
    15 Apr 2025
    Global end of trial reached?
    Yes
    Global end of trial date
    15 Apr 2025
    Was the trial ended prematurely?
    Yes
    General information about the trial
    Main objective of the trial
    The primary objective of the study was to assess the safety of vatiquinone in participants with inherited mitochondrial disease who participated in a previous vatiquinone clinical study or treatment plan.
    Protection of trial subjects
    This study was designed and monitored in accordance with PTC Therapeutics (PTC) procedures, which comply with the ethical principles of Good Clinical Practice as required by the major regulatory authorities, and in accordance with the Declaration of Helsinki.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    22 Jun 2022
    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: 3
    Country: Number of subjects enrolled
    United States: 70
    Country: Number of subjects enrolled
    Italy: 8
    Country: Number of subjects enrolled
    Poland: 5
    Country: Number of subjects enrolled
    Spain: 3
    Country: Number of subjects enrolled
    France: 5
    Country: Number of subjects enrolled
    Japan: 7
    Worldwide total number of subjects
    101
    EEA total number of subjects
    21
    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)
    39
    Adolescents (12-17 years)
    30
    Adults (18-64 years)
    32
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    -

    Pre-assignment
    Screening details
    A total of 103 participants were screened, of which 101 participants were enrolled in the study and received at least 1 dose of vatiquinone.

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

    Arms
    Arm title
    Vatiquinone
    Arm description
    Participants received vatiquinone oral solution (100 milligrams [mg]/milliliter [mL]), up to 400 mg, administered orally or via feeding tube 3 times daily (TID).
    Arm type
    Experimental

    Investigational medicinal product name
    Vatiquinone
    Investigational medicinal product code
    PTC743
    Other name
    Pharmaceutical forms
    Oral solution
    Routes of administration
    Oral use
    Dosage and administration details
    Vatiquinone was administered per dose and schedule specified in the arm description.

    Number of subjects in period 1
    Vatiquinone
    Started
    101
    Received At Least 1 Dose of Study Drug
    101
    Completed
    0
    Not completed
    101
         Sponsor's decision
    85
         Consent withdrawn by subject
    3
         Adverse event, non-fatal
    6
         Death
    1
         Other than specified
    3
         Lost to follow-up
    3

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Vatiquinone
    Reporting group description
    Participants received vatiquinone oral solution (100 milligrams [mg]/milliliter [mL]), up to 400 mg, administered orally or via feeding tube 3 times daily (TID).

    Reporting group values
    Vatiquinone Total
    Number of subjects
    101 101
    Age Categorical
    Units: Subjects
    Age Continuous
    Units: years
        arithmetic mean (standard deviation)
    15.5 ( 11.56 ) -
    Gender Categorical
    Units: Subjects
        Female
    49 49
        Male
    52 52
    Race
    Units: Subjects
        American Indian/Alaska Native
    1 1
        Asian
    8 8
        Black/African American
    2 2
        White
    83 83
        Other
    1 1
        Unknown
    1 1
        Missing
    5 5
    Ethnicity
    Units: Subjects
        Hispanic or Latino
    9 9
        Not Hispanic or Latino
    86 86
        Not Reported
    3 3
        Unknown
    2 2
        Missing
    1 1

    End points

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    End points reporting groups
    Reporting group title
    Vatiquinone
    Reporting group description
    Participants received vatiquinone oral solution (100 milligrams [mg]/milliliter [mL]), up to 400 mg, administered orally or via feeding tube 3 times daily (TID).

    Primary: Number of Participants With Treatment-emergent Adverse Events (TEAEs)

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    End point title
    Number of Participants With Treatment-emergent Adverse Events (TEAEs) [1]
    End point description
    An adverse event (AE) was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. AEs included both serious adverse events (SAEs) and non-serious AEs. A TEAE was defined as an AE that had an onset date or date of worsening on or after the first dose of study drug and within 30 days of the date of the last dose of treatment. A summary of other non-serious AEs and all SAEs, regardless of causality is located in the 'Reported AE section'. Safety population included all participants who received at least 1 dose of vatiquinone in the study.
    End point type
    Primary
    End point timeframe
    Baseline (Day 1) up to 30 days after last dose of study drug (956 days)
    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: The analysis was descriptive in nature.
    End point values
    Vatiquinone
    Number of subjects analysed
    101
    Units: participants
    91
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    Baseline (Day 1) up to 30 days after last dose of study drug (956 days)
    Adverse event reporting additional description
    Safety population included all participants who received at least 1 dose of vatiquinone in the study.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    26.0
    Reporting groups
    Reporting group title
    Vatiquinone
    Reporting group description
    Participants received vatiquinone oral solution (100 mg/mL), up to 400 mg, administered orally or via feeding tube TID.

    Serious adverse events
    Vatiquinone
    Total subjects affected by serious adverse events
         subjects affected / exposed
    45 / 101 (44.55%)
         number of deaths (all causes)
    7
         number of deaths resulting from adverse events
    Surgical and medical procedures
    Tracheostomy
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    General disorders and administration site conditions
    Hypothermia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Death
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 1
    Generalised oedema
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 1
    Respiratory, thoracic and mediastinal disorders
    Acute respiratory failure
         subjects affected / exposed
    11 / 101 (10.89%)
         occurrences causally related to treatment / all
    0 / 16
         deaths causally related to treatment / all
    0 / 3
    Acute respiratory distress syndrome
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Asthma
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Cough
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Hypercapnia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 3
         deaths causally related to treatment / all
    0 / 0
    Hypoxia
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Respiratory failure
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Pulmonary amyloidosis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Respiratory distress
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Investigations
    SARS-CoV-2 test positive
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Injury, poisoning and procedural complications
    Femur fracture
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Fall
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Postoperative ileus
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Congenital, familial and genetic disorders
    Fanconi syndrome
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Cardiac disorders
    Atrial fibrillation
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Tachycardia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Cardiomyopathy
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Nervous system disorders
    Change in seizure presentation
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Epilepsy
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Autonomic nervous system imbalance
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Myoclonus
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Optic neuritis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Seizure
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 3
         deaths causally related to treatment / all
    0 / 0
    Status epilepticus
         subjects affected / exposed
    3 / 101 (2.97%)
         occurrences causally related to treatment / all
    0 / 4
         deaths causally related to treatment / all
    0 / 0
    Blood and lymphatic system disorders
    Anaemia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Gastrointestinal disorders
    Abdominal pain
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Constipation
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Diarrhoea
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Erosive oesophagitis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Gastrointestinal haemorrhage
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Oesophagitis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Pancreatitis acute
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Pancreatitis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Pneumoperitoneum
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Vomiting
         subjects affected / exposed
    4 / 101 (3.96%)
         occurrences causally related to treatment / all
    0 / 4
         deaths causally related to treatment / all
    0 / 0
    Intestinal obstruction
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Hepatobiliary disorders
    Hepatic failure
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 1
    Renal and urinary disorders
    Acute kidney injury
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Endocrine disorders
    Adrenal insufficiency
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Musculoskeletal and connective tissue disorders
    Muscular weakness
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Infections and infestations
    Bronchitis
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    COVID-19
         subjects affected / exposed
    3 / 101 (2.97%)
         occurrences causally related to treatment / all
    0 / 3
         deaths causally related to treatment / all
    0 / 0
    Influenza
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Lower respiratory tract infection
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Pneumonia
         subjects affected / exposed
    10 / 101 (9.90%)
         occurrences causally related to treatment / all
    0 / 11
         deaths causally related to treatment / all
    0 / 0
    Pneumonia aspiration
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Pseudomonas infection
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Respiratory tract infection
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Rhinovirus infection
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Sepsis
         subjects affected / exposed
    2 / 101 (1.98%)
         occurrences causally related to treatment / all
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    Streptococcal infection
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Urosepsis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Urinary tract infection
         subjects affected / exposed
    3 / 101 (2.97%)
         occurrences causally related to treatment / all
    0 / 3
         deaths causally related to treatment / all
    0 / 0
    Tracheitis
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Metabolism and nutrition disorders
    Hypokalaemia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Hypercalcaemia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Hyponatraemia
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Mitochondrial cytopathy
         subjects affected / exposed
    1 / 101 (0.99%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 1
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Vatiquinone
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    59 / 101 (58.42%)
    Investigations
    Gamma-glutamyltransferase increased
         subjects affected / exposed
    6 / 101 (5.94%)
         occurrences all number
    7
    Nervous system disorders
    Seizure
         subjects affected / exposed
    9 / 101 (8.91%)
         occurrences all number
    9
    General disorders and administration site conditions
    Pyrexia
         subjects affected / exposed
    12 / 101 (11.88%)
         occurrences all number
    24
    Gastrointestinal disorders
    Diarrhoea
         subjects affected / exposed
    6 / 101 (5.94%)
         occurrences all number
    7
    Vomiting
         subjects affected / exposed
    11 / 101 (10.89%)
         occurrences all number
    15
    Infections and infestations
    COVID-19
         subjects affected / exposed
    13 / 101 (12.87%)
         occurrences all number
    14
    Nasopharyngitis
         subjects affected / exposed
    7 / 101 (6.93%)
         occurrences all number
    9
    Pneumonia
         subjects affected / exposed
    6 / 101 (5.94%)
         occurrences all number
    9
    Respiratory tract infection
         subjects affected / exposed
    6 / 101 (5.94%)
         occurrences all number
    10
    Upper respiratory tract infection
         subjects affected / exposed
    14 / 101 (13.86%)
         occurrences all number
    19
    Urinary tract infection
         subjects affected / exposed
    9 / 101 (8.91%)
         occurrences all number
    9

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    11 Apr 2022
    Overall reason for this amendment: All participants rolling over to this study followed the same visit scheme from Screening/Baseline Visit.

    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 study was terminated early as PTC discontinued clinical development of vatiquinone for this indication based on prior clinical study results.
    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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