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    Clinical Trial Results:
    A Global, Open-Label, Multicenter, Phase 1/2 Study of the Safety and Dose Escalation of BAX 888, an Adeno-Associated Virus Serotype 8 (AAV8) Vector Expressing B-Domain Deleted Factor VIII (BDD-FVIII) in Severe Hemophilia A Subjects Administered a Single Intravenous Infusion

    Summary
    EudraCT number
    2015-005576-22
    Trial protocol
    IT  
    Global end of trial date
    09 Jul 2024

    Results information
    Results version number
    v1(current)
    This version publication date
    25 Jul 2025
    First version publication date
    25 Jul 2025
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    201501
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT03370172
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    Takeda
    Sponsor organisation address
    500 Kendall Street, Cambridge, MA, United States, 02142
    Public contact
    Study Director, Takeda, TrialDisclosures@takeda.com
    Scientific contact
    Study Director, Takeda, TrialDisclosures@takeda.com
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    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
    09 Jul 2024
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    09 Jul 2024
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    The main objective of the trial was to evaluate the safety of a single intravenous (IV) infusion of BAX 888 in 2 dose cohorts.
    Protection of trial subjects
    Participant signed an informed consent form (ICF) before participating in the study.
    Background therapy
    NA
    Evidence for comparator
    NA
    Actual start date of recruitment
    27 Feb 2018
    Long term follow-up planned
    Yes
    Long term follow-up rationale
    Safety
    Long term follow-up duration
    4 Years
    Independent data monitoring committee (IDMC) involvement?
    Yes
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    France: 1
    Country: Number of subjects enrolled
    Spain: 3
    Worldwide total number of subjects
    4
    EEA total number of subjects
    4
    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)
    4
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    A total of 4 participants took part in the study globally from 27 February 2018 to 09 July 2024.

    Pre-assignment
    Screening details
    Participants with severe Hemophilia A participated in the study to receive BAX 888.

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

    Arms
    Are arms mutually exclusive
    No

    Arm title
    Cohort 1: BAX 888 2.0*10^12 cp/kg
    Arm description
    Cohort 1 participants received a single peripheral intravenous (IV) infusion of BAX 888 at a dose of 2.0*10^12 capsid particles per kilogram (cp/kg) on the day of dosing (Day 0).
    Arm type
    Experimental

    Investigational medicinal product name
    BAX 888
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Intravenous use
    Dosage and administration details
    Cohort 1 participants received a single peripheral intravenous (IV) infusion of BAX 888 at a dose of 2.0*10^12 capsid particles per kilogram (cp/kg) on the day of dosing (Day 0).

    Arm title
    Cohort 2: BAX 888 6.0*10^12 cp/kg
    Arm description
    Cohort 2 participants received a single peripheral IV infusion of BAX 888 at a dose of 6.0*10^12 cp/kg on the day of dosing (Day 0).
    Arm type
    Experimental

    Investigational medicinal product name
    BAX 888
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Intravenous use
    Dosage and administration details
    Cohort 2 participants received a single peripheral IV infusion of BAX 888 at a dose of 6.0*10^12 cp/kg on the day of dosing (Day 0).

    Number of subjects in period 1
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Started
    2
    2
    Completed
    2
    1
    Not completed
    0
    1
         Consent withdrawn by subject
    -
    1

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Cohort 1: BAX 888 2.0*10^12 cp/kg
    Reporting group description
    Cohort 1 participants received a single peripheral intravenous (IV) infusion of BAX 888 at a dose of 2.0*10^12 capsid particles per kilogram (cp/kg) on the day of dosing (Day 0).

    Reporting group title
    Cohort 2: BAX 888 6.0*10^12 cp/kg
    Reporting group description
    Cohort 2 participants received a single peripheral IV infusion of BAX 888 at a dose of 6.0*10^12 cp/kg on the day of dosing (Day 0).

    Reporting group values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg Total
    Number of subjects
    2 2
    Age Categorical
    Units: Subjects
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    29.5 ( 13.44 ) 27.5 ( 3.54 ) -
    Gender categorical
    Units: Subjects
        Female
    0 0 0
        Male
    2 2 4
    Race (NIH/OMB)
    Units: Subjects
        American Indian or Alaska Native
    0 0 0
        Asian
    0 0 0
        Native Hawaiian or Other Pacific Islander
    0 0 0
        Black or African American
    0 0 0
        White
    2 2 4
        More than one race
    0 0 0
        Unknown or Not Reported
    0 0 0
    Ethnicity (NIH/OMB)
    Units: Subjects
        Hispanic or Latino
    0 0 0
        Not Hispanic or Latino
    2 2 4
        Unknown or Not Reported
    0 0 0

    End points

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    End points reporting groups
    Reporting group title
    Cohort 1: BAX 888 2.0*10^12 cp/kg
    Reporting group description
    Cohort 1 participants received a single peripheral intravenous (IV) infusion of BAX 888 at a dose of 2.0*10^12 capsid particles per kilogram (cp/kg) on the day of dosing (Day 0).

    Reporting group title
    Cohort 2: BAX 888 6.0*10^12 cp/kg
    Reporting group description
    Cohort 2 participants received a single peripheral IV infusion of BAX 888 at a dose of 6.0*10^12 cp/kg on the day of dosing (Day 0).

    Primary: Number of Participants With BAX 888-Related Adverse Events (AEs)

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    End point title
    Number of Participants With BAX 888-Related Adverse Events (AEs) [1]
    End point description
    An AE is defined as any untoward medical occurrence in a participant administered an investigational product (IP) that does not necessarily have a causal relationship with the treatment. A Serious adverse event (SAE) is an AE resulting in any of the following outcomes: death; life-threatening event; required or prolonged inpatient hospitalization; persistent or significant disability/incapacity; congenital anomaly. AEs include both serious and non-serious adverse events including development of FVIII inhibitory antibodies, clinically significant changes in standard laboratory parameters, physical exam, and vital signs. The Safety Set consisted of all participants who received any amount of investigational product.
    End point type
    Primary
    End point timeframe
    From first dose up to end of the study (approximately 6 years)
    Notes
    [1] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point.
    Justification: Only descriptive analyses were planned for this outcome measure.
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: participants
    2
    2
    No statistical analyses for this end point

    Secondary: Change from Baseline in Circulating Plasma FVIII Activity Level

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    End point title
    Change from Baseline in Circulating Plasma FVIII Activity Level
    End point description
    Change from baseline in circulating plasma FVIII activity level, based on one-stage clotting assay was assessed. The Safety Set consisted of all participants who received any amount of investigational product. Subjects analysed is the number of participants with data available for analysis for this outcome measure. 99999 indicates standard deviation (SD) is not estimable when there is only a single participant.
    End point type
    Secondary
    End point timeframe
    Baseline, up to Month 60
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    1
    Units: International Units per deciliter(IU/dL)
        arithmetic mean (standard deviation)
    11.40 ( 1.131 )
    248.30 ( 99999 )
    No statistical analyses for this end point

    Secondary: Change from Baseline in Circulating Plasma FVIII Antigen Level

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    End point title
    Change from Baseline in Circulating Plasma FVIII Antigen Level
    End point description
    Change from baseline in circulating plasma FVIII antigen (protein) levels were to be assessed. As pre-specified in the statistical analysis plan (SAP), the descriptive analysis for this outcome measure was not performed.
    End point type
    Secondary
    End point timeframe
    Baseline, up to Month 60
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    0 [2]
    0 [3]
    Units: international units per milliliter
        arithmetic mean (standard deviation)
    ( )
    ( )
    Notes
    [2] - Descriptive analysis for this outcome measure was not performed, as pre-specified in the SAP.
    [3] - Descriptive analysis for this outcome measure was not performed, as pre-specified in the SAP.
    No statistical analyses for this end point

    Secondary: Percentage of Participants With a Reduction in Consumption of Exogenous FVIII

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    End point title
    Percentage of Participants With a Reduction in Consumption of Exogenous FVIII
    End point description
    The reduction in consumption of exogenous FVIII was assessed by comparing the amount of exogenous FVIII taken at earliest time point available (prior to BAX 888 infusion) with the amount taken at the last post-infusion timepoint available, during the study. Percentage of participants with reduction in consumption of exogenous FVIII are reported. The Safety Set consisted of all participants who received any amount of investigational product.
    End point type
    Secondary
    End point timeframe
    Up to approximately 6 years 4 months
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: percentage of participants
        number (not applicable)
    0.0
    0.0
    No statistical analyses for this end point

    Secondary: Annualized Bleed Rate (ABR)

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    End point title
    Annualized Bleed Rate (ABR)
    End point description
    ABR in comparison to before gene transfer will be assessed. A bleed is defined as subjective or objective evidence of bleeding which may or may not require treatment with FVIII. ABR was calculated as (number of bleeding episodes/observed treatment period in days)*365.25. The Safety Set consisted of all participants who received any amount of investigational product.
    End point type
    Secondary
    End point timeframe
    Up to approximately 6 years 4 months
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: bleeds per year
        arithmetic mean (standard deviation)
    1.0 ( 1.41 )
    0.5 ( 0.71 )
    No statistical analyses for this end point

    Secondary: Number of Participants Who Developed Total Binding Antibodies to FVIII

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    End point title
    Number of Participants Who Developed Total Binding Antibodies to FVIII
    End point description
    Participants were assessed to check if they developed total binding antibodies to FVIII (Immunoglobulin G [IgG], Immunoglobulin M [IgM]). The Safety Set consisted of all participants who received any amount of investigational product.
    End point type
    Secondary
    End point timeframe
    Up to approximately 6 years 4 months
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: participants
    0
    0
    No statistical analyses for this end point

    Secondary: Number of Participants Who Developed Inhibitory Antibodies to FVIII

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    End point title
    Number of Participants Who Developed Inhibitory Antibodies to FVIII
    End point description
    Participants were assessed to check if they developed inhibitory antibodies to FVIII. The Safety Set consisted of all participants who received any amount of investigational product.
    End point type
    Secondary
    End point timeframe
    Up to approximately 6 years 4 months
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: participants
    0
    0
    No statistical analyses for this end point

    Secondary: Surveillance of AAV8 Genome Shedding

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    End point title
    Surveillance of AAV8 Genome Shedding
    End point description
    Surveillance of AAV8 genome shedding in blood, saliva, semen, stool and urine until two consecutive negative results were assessed. 'n' indicates the number of participants with data available for analysis at the specified time points. 99999 indicates SD was not estimable for a single participant. 9999 indicates mean and SD were not estimable due to genome concentrations being Below Limit of Detection and 999 indicates no participant was available for analysis. The Safety Set consisted of all participants who received any amount of investigational product. The data was collected for each category until 2 consecutive measurements are negative.
    End point type
    Secondary
    End point timeframe
    Blood: Day 1, weekly at Clinic Visits between Weeks 1-15, and at Months 4 and 5; Saliva, Semen, and Stool: Day 1 and Week 1; Urine: Day 1 and Weeks 1,2,3
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: Genome copies per 100 ng of sample
    arithmetic mean (standard deviation)
        Blood: Day 1 (n=0,1)
    999 ( 999 )
    3684434.0 ( 99999 )
        Blood: Week 1 (n=1,2)
    3634.0 ( 99999 )
    18608.0 ( 664.68 )
        Blood: Week 2 (n=2,2)
    2076.0 ( 295.57 )
    10670.0 ( 3900.40 )
        Blood: Week 3 (n=2,2)
    2069.0 ( 741.05 )
    9845.0 ( 6488.41 )
        Blood: Week 4 (n=1,2)
    1098.0 ( 99999 )
    9033.5 ( 4978.74 )
        Blood: Week 5 (n=2,2)
    1483.0 ( 1097.43 )
    7884.0 ( 288.50 )
        Blood: Week 6 (n=2,2)
    904.0 ( 335.17 )
    5372.5 ( 441.94 )
        Blood: Week 7 (n=2,2)
    1004.0 ( 656.20 )
    6808.0 ( 1121.47 )
        Blood: Week 8 (n=2,2)
    828.5 ( 267.99 )
    7384.0 ( 1011.16 )
        Blood: Week 9 (n=2,2)
    714.5 ( 222.74 )
    6384.5 ( 195.87 )
        Blood: Week 10 (n=2,2)
    773.0 ( 9.90 )
    6144.5 ( 939.74 )
        Blood: Week 11 (n=2,2)
    755.0 ( 241.83 )
    3935.0 ( 1547.15 )
        Blood: Week 12 (n=2,2)
    728.0 ( 130.11 )
    3893.5 ( 276.48 )
        Blood: Week 13 (n=2,2)
    654.0 ( 22.63 )
    3044.5 ( 1191.47 )
        Blood: Week 14 (n=2,2)
    735.5 ( 82.73 )
    2856.0 ( 1473.61 )
        Blood: Week 15 (n=1,2)
    742.0 ( 99999 )
    2812.0 ( 2083.14 )
        Blood: Month 4 (n=2,1)
    422.0 ( 192.33 )
    3066.0 ( 99999 )
        Blood: Month 5 (n=0,1)
    999 ( 999 )
    210.0 ( 99999 )
        Saliva: Day 1 (n=2,2)
    935.0 ( 268.70 )
    2076.5 ( 473.05 )
        Saliva: Week 1 (n=0,2)
    999 ( 999 )
    352.5 ( 12.02 )
        Semen: Day 1 (n=1,2)
    55.0 ( 99999 )
    230.5 ( 188.80 )
        Semen: Week 1 (n=0,1)
    999 ( 999 )
    194.0 ( 99999 )
        Stool: Day 1 (n=0,1)
    999 ( 999 )
    5985.0 ( 99999 )
        Stool: Week 1 (n=0,2)
    999 ( 999 )
    7164.0 ( 7993.14 )
        Urine: Day 1 (n=2,2)
    9999 ( 9999 )
    9999 ( 9999 )
        Urine: Week 1 (n=2,2)
    9999 ( 9999 )
    9999 ( 9999 )
        Urine: Week 2 (n=2,2)
    9999 ( 9999 )
    9999 ( 9999 )
        Urine: Week 3 (n=2,2)
    9999 ( 9999 )
    9999 ( 9999 )
    No statistical analyses for this end point

    Secondary: Number of Participants With Humoral and Cell-Mediated Immune Response to AAV8 and FVIII Proteins

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    End point title
    Number of Participants With Humoral and Cell-Mediated Immune Response to AAV8 and FVIII Proteins
    End point description
    Humoral(antibody-mediated)&cell-mediated immune response to adeno-associated virus(AAV8)(the vector)&FVIII proteins,was assessed.Humoral Immune Response:It is indicated by presence of specific antibodies.Anti-AAV8 binding antibodies,IgG or IgM were measured by enzyme-linked immunosorbent assay(ELISA)method.Neutralizing antibodies were measured by cell-based luminescent assay.Cell-mediated Immune response:AAV8 & FVIII specific cell mediated immunity was assessed using validated interferon-γ(IFN-γ) enzyme-linked immunosorbent spot(ELISpot) assays.This assay tests human T-cell recall response to AAV8 & FVIII proteins.These proteins were called antigens for these tests(AAV8 peptide pools1,2,3&two pooled test antigens(1&2)for FVIII).Number of participants with humoral &/or cell mediated immune response to AAV8 & FVIII proteins,are reported by humoral & cell mediated immune response categories.n:participants with data available for analysis for specified categories.999= 0 subjects analyzed.
    End point type
    Secondary
    End point timeframe
    Up to approximately 6 years 4 months
    End point values
    Cohort 1: BAX 888 2.0*10^12 cp/kg Cohort 2: BAX 888 6.0*10^12 cp/kg
    Number of subjects analysed
    2
    2
    Units: participants
        Humoral: Binding Ab to AAV8 IgG Titer (n=2,1)
    2
    1
        Humoral: Binding Ab to AAV8 IgM Titer (n=0,0)
    999
    999
        Humoral: Neutralising Ab to AAV8 Titer (n=2,1)
    2
    1
        Cell-Mediated: AAV8 Peptide Pool 1 Mean (n=2,1)
    0
    1
        Cell-Mediated: AAV8 Peptide Pool 2 Mean (n=2,1)
    1
    1
        Cell-Mediated: AAV8 Peptide Pool 3 Mean (n=2,1)
    1
    1
        Cell-Mediated: FVIII Peptide Pool 1 Mean (n=2,1)
    0
    0
        Cell-Mediated: FVIII Peptide Pool 2 Mean (n=2,1)
    1
    1
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    All-cause mortality: Up to approximately 6 years 4 months; SAEs and Other (Non-Serious) AEs: From first dose up to end of the study (approximately 6 years)
    Adverse event reporting additional description
    The Safety Set consisted of all participants who received any amount of investigational product.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    27.0
    Reporting groups
    Reporting group title
    Cohort 2: BAX 888 6.0*10^12 cp/kg
    Reporting group description
    Cohort 2 participants received a single peripheral IV infusion of BAX 888 at a dose of 6.0*10^12 cp/kg on the day of dosing (Day 0).

    Reporting group title
    Cohort 1: BAX 888 2.0*10^12 cp/kg
    Reporting group description
    Cohort 1 participants received a single peripheral intravenous (IV) infusion of BAX 888 at a dose of 2.0*10^12 capsid particles per kilogram (cp/kg) on the day of dosing (Day 0).

    Serious adverse events
    Cohort 2: BAX 888 6.0*10^12 cp/kg Cohort 1: BAX 888 2.0*10^12 cp/kg
    Total subjects affected by serious adverse events
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         number of deaths (all causes)
    0
    0
         number of deaths resulting from adverse events
    0
    0
    Metabolism and nutrition disorders
    Hypophosphataemia
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences causally related to treatment / all
    1 / 2
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Cohort 2: BAX 888 6.0*10^12 cp/kg Cohort 1: BAX 888 2.0*10^12 cp/kg
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    2 / 2 (100.00%)
    2 / 2 (100.00%)
    Vascular disorders
    Hypertension
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    General disorders and administration site conditions
    Influenza like illness
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    2
    0
    Asthenia
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Respiratory, thoracic and mediastinal disorders
    Dyspnoea
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Rhinorrhoea
         subjects affected / exposed
    1 / 2 (50.00%)
    1 / 2 (50.00%)
         occurrences all number
    1
    1
    Psychiatric disorders
    Initial insomnia
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Irritability
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Investigations
    SARS-CoV-2 test positive
         subjects affected / exposed
    0 / 2 (0.00%)
    2 / 2 (100.00%)
         occurrences all number
    0
    2
    Weight increased
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Injury, poisoning and procedural complications
    Fall
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Ligament sprain
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Cardiac disorders
    Tachycardia
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Nervous system disorders
    Migraine
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    3
    0
    Paraesthesia
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Somnolence
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Headache
         subjects affected / exposed
    1 / 2 (50.00%)
    1 / 2 (50.00%)
         occurrences all number
    6
    2
    Eye disorders
    Dry eye
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Gastrointestinal disorders
    Tongue geographic
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Nausea
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Abdominal pain upper
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    2
    0
    Hepatobiliary disorders
    Hypertransaminasaemia
         subjects affected / exposed
    2 / 2 (100.00%)
    2 / 2 (100.00%)
         occurrences all number
    2
    3
    Skin and subcutaneous tissue disorders
    Rash
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    2
    0
    Night sweats
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Erythema
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Dermatosis
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Dermatitis acneiform
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Dermatitis
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Musculoskeletal and connective tissue disorders
    Synovitis
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Pain in extremity
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Musculoskeletal discomfort
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Musculoskeletal chest pain
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Back pain
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Arthritis
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    2
    Arthralgia
         subjects affected / exposed
    1 / 2 (50.00%)
    1 / 2 (50.00%)
         occurrences all number
    1
    1
    Tendon disorder
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Infections and infestations
    Urinary tract infection
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Upper respiratory tract infection
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Rhinitis
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Pharyngitis
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Nasopharyngitis
         subjects affected / exposed
    0 / 2 (0.00%)
    2 / 2 (100.00%)
         occurrences all number
    0
    2
    Gastroenteritis
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    COVID-19
         subjects affected / exposed
    1 / 2 (50.00%)
    1 / 2 (50.00%)
         occurrences all number
    1
    1
    Metabolism and nutrition disorders
    Hyperphagia
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Hypophosphataemia
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    3
    0
    Increased appetite
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (0.00%)
         occurrences all number
    1
    0
    Vitamin D deficiency
         subjects affected / exposed
    1 / 2 (50.00%)
    0 / 2 (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? Yes
    Date
    Amendment
    15 Mar 2017
    The following changes were made as per Amendment 1: 1. Updated timelines and added an extension trial timeline. 2. Increased target improvement in FVIII from 5% to 20%. 3. Expanded the description of the benefits and the risks. 4. Increased target proportion of participants with improvement in FVII from 50% to 60%. 5. Simplified the original 3 cohort, parallel group design to allow 2 cohorts in sequence.
    24 Jan 2018
    The following changes were made as per Amendment 4: 1. Added Months 24 and 36 to Hemophilia Joint Health Score assessment. 2. Added collection of untoward events in e-diary. 3. Extended exclusion criterion relating to known hypersensitivity to prednisolone or prednisone to also include hypersensitivity to any of the excipients.
    16 Aug 2018
    The following changes were made as per Amendment 5: 1. Eliminated Exclusion Criterion 5: “Positive AAV8 specific T-cell ELISPOTs for any AAV8 peptide pools” and deletion of optional assessment: CMI response to AAV8 and FVIII transgene products (if Screening 2 was longer than 4 weeks from Screening 1). 2. Deleted nonclinical Dose Response Study and Toxicity Study, and added reference to investigator’s Brochure. 3. Deleted administration of 10% of the BAX 888 with “a syringe driver pump” to maintain consistency with BAX 888 Study Pharmacy Manual. 4. Added language to allow additional analyses on efficacy and safety data at trial milestones.
    03 May 2019
    The following changes were made as per Amendment 6: 1. Added Cohort 3. 2. Deleted dose escalation triggered by Week 4 FVIII activity levels from Cohort 2. 3. Updated recruitment period. 4. Updated targeted accrual to reflect addition of Cohort 3. 5. Deleted the Short (Accelerated) Tapering Regimen for corticosteroids. 6. Updated immunosuppression with prophylactic corticosteroids.
    12 Mar 2020
    The following changes were made as per Amendment 7: 1. Specified the minimum data on which the DMC recommendation will be based. 2. Updated cohort expansion rules for Cohort 2. 3. Updated cohort expansion and rules for dose escalation to Cohort 2 and Cohort 3 doses. 4. Lowered the dose for Cohort 3 from 1.8 x 10^13 cp/kg to 1.2 × 10^13 cp/kg. 5. Deleted Inclusion Criterion 4 (normal prothrombin time) and instead inserted new Exclusion Criterion 17 to provide upper limit of prothrombin time international normalized ratio. 6. Added AAV2 binding and neutralizing antibodies as exploratory assay.
    22 Mar 2021
    The following changes were made as per Amendment 8: 1. Revised Trial Completion Date to Q3 2026. 2. Revised trial duration from 5 years to 8 years. 3. Deleted text regarding an additional 2 years in an extension trial. 4. Added evaluations at Months 36, 48, and 60. 5. Added long-term safety and efficacy evaluations annually at years 4 and 5. 6. Increased overall duration of the trial from 6 to 8 years because trial completion was changed from 3 to 5 years post gene transfer.
    10 Nov 2021
    The following changes were made as per Amendment 9: 1. Updated sponsor information and protocol history on the Title Page, Protocol signature page, Section 14.6, Figure 2, and Figure 3.

    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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