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    Clinical Trial Results:
    A Phase 2, Open Label, Multiple Dose Escalation Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Voxelotor in Patients with Sickle Cell Disease

    Summary
    EudraCT number
    2019-001838-34
    Trial protocol
    GB  
    Global end of trial date
    08 Jun 2021

    Results information
    Results version number
    v1(current)
    This version publication date
    03 Jun 2022
    First version publication date
    03 Jun 2022
    Other versions
    Summary report(s)
    GBT400-029_Clinical Study Report

    Trial information

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    Trial identification
    Sponsor protocol code
    GBT440-029
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT04247594
    WHO universal trial number (UTN)
    -
    Other trial identifiers
    IND number: 121,691
    Sponsors
    Sponsor organisation name
    Global Blood Therapeutics, Inc.
    Sponsor organisation address
    181 Oyster Point Blvd, South San Francisco, California, United States, 94080
    Public contact
    Eleanor Lisbon, Global Blood Therapeutics, Inc., 001 650822 8731, elisbon@gbt.com
    Scientific contact
    Eleanor Lisbon, Global Blood Therapeutics, Inc., 001 650822 8731, elisbon@gbt.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
    14 Jul 2021
    Is this the analysis of the primary completion data?
    Yes
    Primary completion date
    08 Jun 2021
    Global end of trial reached?
    Yes
    Global end of trial date
    08 Jun 2021
    Was the trial ended prematurely?
    Yes
    General information about the trial
    Main objective of the trial
    To evaluate the tolerability and safety of voxelotor at daily doses of >1500 mg (2000 mg to 3000 mg) in participants with sickle cell disease (SCD)
    Protection of trial subjects
    The Investigator informed, and obtained approval from, the Independent Ethics Committee (IEC)/Institutional Review Board (IRB) for the conduct of the study at named sites, for the protocol, the subject informed consent form (ICF), and any other written information that was provided to the subjects and any advertisements that were used. Proposed amendments to the protocol and documents were discussed with the Sponsor and contract research organization (CRO), and then submitted to the IEC/IRB for approval as well as submitted to regulatory authorities for approval prior to implementation. The study was conducted according to the protocol; guidelines established by International Council for Harmonisation (ICH) for Good Clinical Practice (GCP) in clinical studies; United States (US) regulations (21 CFR Parts 50, 54, 56, and 312); and country-specific requirements, as applicable. Each individual was provided with oral and written information describing the nature, purpose and duration of the study, participation/termination conditions, and risks and benefits. Prior to initiation of any study-related procedures, subjects signed and dated the ICF to participate in the study.
    Background therapy
    None
    Evidence for comparator
    None
    Actual start date of recruitment
    29 Nov 2019
    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 Kingdom: 6
    Worldwide total number of subjects
    6
    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)
    0
    Adults (18-64 years)
    6
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    The study enrolled male and female patients aged 18 to <60 years inclusive who fulfilled all the inclusion criteria for study enrollment as per Section 4.1 of the GBT440-029 Study Protocol.

    Pre-assignment
    Screening details
    All patients completed the following study procedures prior to a confirmation of eligibility: Signed Informed Consent Form, Review inclusion/exclusion criteria, Medication and Medical History, Height/Weight/ BMI, Vital signs, ECG (12-lead) in triplicate, Physical examination, Serum pregnancy test (females of child-bearing potential only) and so on.

    Pre-assignment period milestones [1] [2]
    Number of subjects started
    9 [3]
    Intermediate milestone: Number of subjects
    Signed Informed Consent: 9
    Intermediate milestone: Number of subjects
    Review Inclusion/exclusion criteria: 6
    Intermediate milestone: Number of subjects
    Medication and medical history: 6
    Intermediate milestone: Number of subjects
    Height/Weight/BMI: 6
    Intermediate milestone: Number of subjects
    Vital Signs: 6
    Intermediate milestone: Number of subjects
    ECG (12-lead) in triplicate: 6
    Intermediate milestone: Number of subjects
    Physical Examination: 6
    Intermediate milestone: Number of subjects
    Serum pregnancy test (females only): 3
    Intermediate milestone: Number of subjects
    Coagulation panel: 6
    Intermediate milestone: Number of subjects
    Serology panel (PT, PTT, INR): 6
    Intermediate milestone: Number of subjects
    Blood for hematology and chemistry: 6
    Intermediate milestone: Number of subjects
    Hemoglobin genotype testing: 6
    Intermediate milestone: Number of subjects
    Fetal hemoglobin: 6
    Intermediate milestone: Number of subjects
    Urinalysis: 6
    Intermediate milestone: Number of subjects
    Concomitant medications: 6
    Intermediate milestone: Number of subjects
    Adverse events: 6
    Number of subjects completed
    6

    Pre-assignment subject non-completion reasons
    Reason: Number of subjects
    Did not meet eligibility criteria: 3
    Notes
    [1] - The number of subjects at the milestone is less than the number that completed the pre-assignment period. It is expected the number of subjects at the milestones will be greater than, or equal to the number that completed the pre-assignment period.
    Justification: A total of 9 subjects were screened for inclusion in the study prior to study termination; of these, 3 subjects did not meet eligibility criteria
    [2] - The number of subjects at the milestone exceeds the number at the preceding milestone. It is expected the number of subjects at each milestone will be less than, or equal to the number at the preceding milestone in the pre-assignment period.
    Justification: A total of 9 subjects were screened for inclusion in the study prior to study termination; of these, 3 subjects did not meet eligibility criteria
    [3] - The number of subjects reported to have started the pre-assignment period are not the same as the worldwide number enrolled in the trial. It is expected that these numbers will be the same.
    Justification: A total of 9 subjects were screened for inclusion in the study prior to study termination; of these, 3 subjects did not meet eligibility criteria
    Period 1
    Period 1 title
    Treatment (overall period)
    Is this the baseline period?
    Yes
    Allocation method
    Not applicable
    Blinding used
    Not blinded

    Arms
    Arm title
    Treatment
    Arm description
    Treatment Period (Dose Escalation): Periods 1-4 of voxelotor administration at progressively higher cumulative daily dose levels from 1500 mg until either an MTD or 3000 mg cumulative daily dose was reached, whichever occurred first
    Arm type
    Experimental

    Investigational medicinal product name
    Voxelotor
    Investigational medicinal product code
    GBT440
    Other name
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    Voxelotor was supplied as 500 mg tablets. Subjects received voxelotor tablets administered orally, once daily or twice daily. Study subjects were to undergo up to four periods of voxelotor administration at progressively higher cumulative daily dose levels from 1500 mg until either an MTD or 3000 mg cumulative daily dose was reached, whichever occurred first. The four periods were as follows: • Period 1: 1500 mg per day: 1500 mg once daily (3 × 500 mg tablets) for 3 weeks (± 3 days) • Period 2: 2000 mg per day: 1000 mg (2 × 500 mg) twice daily for 3 weeks (± 3 days) • Period 3: 2500 mg per day: 1500 mg (3 × 500 mg) in the morning and 1000 mg (2 × 500 mg) in the evening daily for 3 weeks (± 3 days) • Period 4: 3000 mg per day: 1500 mg (3 × 500 mg) twice daily for 3 weeks (± 3 days)

    Number of subjects in period 1
    Treatment
    Started
    6
    Review Inclusion/Exclusion criteria
    6
    Medication and medical history
    6
    Height/weight/BMI
    6
    Vital Signs
    6
    ECG (12-lead) in triplicate
    6
    Physical examination
    6
    Urine pregnancy test (females only)
    3
    Blood for hematology and chemistry
    6
    Erythropoietin
    6
    RBC deformability, dense cells
    6
    Hemoximetry (P50 and P20)
    6
    Study drug administration
    6
    Blood for PK assessment
    6
    CGI-C and PGI-C
    6
    Concomitant medications
    6
    Adverse events
    6
    Completed
    2
    Not completed
    4
         Consent withdrawn by subject
    4

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Treatment
    Reporting group description
    Subjects treated with at least one dose of Voxelotor

    Reporting group values
    Treatment Total
    Number of subjects
    6 6
    Age categorical
    Units: Subjects
        Adults (18-64 years)
    6 6
    Age continuous
    Units: years
        median (full range (min-max))
    32 (27 to 36) -
    Gender categorical
    Units: Subjects
        Female
    3 3
        Male
    3 3
    Race
    Units: Subjects
        Black or African American
    6 6
    Ethnicity
    Units: Subjects
        Not Hispanic or Latino
    6 6
    Weight
    Weight of subjects
    Units: kg
        median (full range (min-max))
    66.45 (47 to 74.9) -
    Height
    Units: cm
        median (full range (min-max))
    171 (163 to 190) -
    BMI
    Units: kg/m3
        median (full range (min-max))
    22 (18 to 28) -
    Subject analysis sets

    Subject analysis set title
    Safety Population
    Subject analysis set type
    Full analysis
    Subject analysis set description
    Subjects treated with at least one dose of voxelotor

    Subject analysis sets values
    Safety Population
    Number of subjects
    6
    Age categorical
    Units: Subjects
        Adults (18-64 years)
    6
    Age continuous
    Units: years
        median (full range (min-max))
    32 (27 to 36)
    Gender categorical
    Units: Subjects
        Female
    3
        Male
    3
    Race
    Units: Subjects
        Black or African American
    6
    Ethnicity
    Units: Subjects
        Not Hispanic or Latino
    6
    Weight
    Weight of subjects
    Units: kg
        median (full range (min-max))
    66.45 (47 to 74.9)
    Height
    Units: cm
        median (full range (min-max))
    171 (163 to 190)
    BMI
    Units: kg/m3
        median (full range (min-max))
    22 (18 to 28)

    End points

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    End points reporting groups
    Reporting group title
    Treatment
    Reporting group description
    Treatment Period (Dose Escalation): Periods 1-4 of voxelotor administration at progressively higher cumulative daily dose levels from 1500 mg until either an MTD or 3000 mg cumulative daily dose was reached, whichever occurred first

    Subject analysis set title
    Safety Population
    Subject analysis set type
    Full analysis
    Subject analysis set description
    Subjects treated with at least one dose of voxelotor

    Primary: Treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs)

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    End point title
    Treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs) [1]
    End point description
    Sickle cell disease (SCD)-related Treatment-emergent Adverse Events—Safety Population taken 1500mg daily dose of Voxelotor
    End point type
    Primary
    End point timeframe
    Any new or worsening events which occurs after first dose or through 28 days after study drug discontinuation
    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 testing was ever planned for this study as per the study protocol
    End point values
    Treatment Safety Population
    Number of subjects analysed
    6
    6
    Units: Number of subjects
        Number of subjects with at least one TEAE
    5
    5
        Number of subjects with at least one TEAE ≥ Grade
    3
    3
        Number of subjects with at least one SAE
    3
    3
        Number of SAEs
    4
    4
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    All adverse events were recorded from the time the study participant signs the informed consent form (ICF) until 28 days after the last dose of study drug.
    Adverse event reporting additional description
    Adverse events were coded using the Medical Dictionary for Regulatory Activities Dictionary (MedDRA) version 24.0 and were categorized by system organ class (SOC) and preferred term (PT). National Cancer Institute-Common Terminology Criteria for Adverse Events (NCI-CTCAE) version 4.03 was used to determine the grade.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    24
    Reporting groups
    Reporting group title
    1500mg
    Reporting group description
    Adverse events occurring in subjects treated with voxelotor 1500 mg once daily in Period 1

    Reporting group title
    2000mg
    Reporting group description
    Adverse events occurring in subjects treated with voxelotor cumulative daily dose of 2000 mg in Period 2

    Reporting group title
    2500mg
    Reporting group description
    Adverse events occurring in subjects treated with voxelotor cumulative daily dose of 2500 mg in Period 3

    Reporting group title
    3000mg
    Reporting group description
    Adverse events occurring in subjects treated with voxelotor cumulative daily dose of 3000 mg in Period 4

    Serious adverse events
    1500mg 2000mg 2500mg 3000mg
    Total subjects affected by serious adverse events
         subjects affected / exposed
    6 / 6 (100.00%)
    4 / 4 (100.00%)
    3 / 3 (100.00%)
    1 / 1 (100.00%)
         number of deaths (all causes)
    0
    0
    0
    0
         number of deaths resulting from adverse events
    0
    0
    0
    0
    Blood and lymphatic system disorders
    Sickle cell anaemia with crisis
         subjects affected / exposed
    5 / 6 (83.33%)
    1 / 4 (25.00%)
    1 / 3 (33.33%)
    0 / 1 (0.00%)
         occurrences causally related to treatment / all
    0 / 5
    0 / 1
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    0 / 0
    Reproductive system and breast disorders
    Priapism
         subjects affected / exposed
    1 / 6 (16.67%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
    0 / 0
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    0 / 0
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    1500mg 2000mg 2500mg 3000mg
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    6 / 6 (100.00%)
    4 / 4 (100.00%)
    3 / 3 (100.00%)
    1 / 1 (100.00%)
    Investigations
    Alanine aminotransferase increased
         subjects affected / exposed
    1 / 6 (16.67%)
    0 / 4 (0.00%)
    2 / 3 (66.67%)
    0 / 1 (0.00%)
         occurrences all number
    1
    0
    2
    0
    Aspartate aminotransferase increased
         subjects affected / exposed
    0 / 6 (0.00%)
    0 / 4 (0.00%)
    2 / 3 (66.67%)
    0 / 1 (0.00%)
         occurrences all number
    0
    0
    2
    0
    Nervous system disorders
    Headache
         subjects affected / exposed
    1 / 6 (16.67%)
    2 / 4 (50.00%)
    1 / 3 (33.33%)
    0 / 1 (0.00%)
         occurrences all number
    1
    2
    1
    0
    General disorders and administration site conditions
    Fatigue
         subjects affected / exposed
    2 / 6 (33.33%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    2
    0
    0
    0
    Gastrointestinal disorders
    Abdominal pain upper
         subjects affected / exposed
    2 / 6 (33.33%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    2
    0
    0
    0
    Constipation
         subjects affected / exposed
    2 / 6 (33.33%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    2
    0
    0
    0
    Diarrhoea
         subjects affected / exposed
    4 / 6 (66.67%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    4
    0
    0
    0
    Dry mouth
         subjects affected / exposed
    1 / 6 (16.67%)
    0 / 4 (0.00%)
    1 / 3 (33.33%)
    0 / 1 (0.00%)
         occurrences all number
    1
    0
    1
    0
    Nausea
         subjects affected / exposed
    2 / 6 (33.33%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    2
    0
    0
    0
    Skin and subcutaneous tissue disorders
    Dry skin
         subjects affected / exposed
    1 / 6 (16.67%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    1
    0
    0
    0
    Pruritus allergic
         subjects affected / exposed
    1 / 6 (16.67%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    1
    0
    0
    0
    Musculoskeletal and connective tissue disorders
    Pain in extremity
         subjects affected / exposed
    0 / 6 (0.00%)
    1 / 4 (25.00%)
    0 / 3 (0.00%)
    1 / 1 (100.00%)
         occurrences all number
    0
    1
    0
    1
    Back pain
         subjects affected / exposed
    2 / 6 (33.33%)
    0 / 4 (0.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    2
    0
    0
    0
    Infections and infestations
    Urinary tract infection
         subjects affected / exposed
    1 / 6 (16.67%)
    1 / 4 (25.00%)
    0 / 3 (0.00%)
    0 / 1 (0.00%)
         occurrences all number
    1
    1
    0
    0

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    13 Sep 2019
    Change 1.: - Excluded patients who require strong inducers of CYP2B6, CYP2C9, CYP2C19, and CYP3A4/CYP3A5, and patients who use astemizole, cisapride, or terfenadine Rationale: - To align with the Investigator Brochure list of contraindicated medications Change 2.: Excluded patients who use strong inhibitors of CYP3A4 Rationale: - Since GBT440-029 study will be evaluating higher doses that were not previously tested; the concomitant use of strong CYP3A4 inhibitors was prohibited as a precautionary measure.
    05 Oct 2020
    The purpose of this amendment was as follows: 1. The study design was streamlined to reduce the burden on investigator sites as directed by the Health Authority (MHRA): a. A reduction in the duration of treatment for participants in Cohort A – the duration of Periods 1 and 4 (originally Cohort A, Periods 1 and 4) was reduced from 9 weeks to 3 weeks. Each period now represents a 3‑week safety evaluation period/dose-limiting toxicity window followed by a 24-week observation period at the maximum tolerated dose or 3000 mg daily, followed by a 28day safety follow-up period. b. Multi-dose PK analysis (serial PK sampling) was changed to population PK approach (sparse sampling) c. No overnight stay in the Research unit d. Removal of Cohort B and associated evaluations, including magnetic resonance imaging (MRI) and cardiopulmonary exercise testing (CPET), from the study design e. Streamline of ECG recordings – ECG recordings was aligned with PK samples to allow for a combined evaluation of overall safety and QTc analysis. In addition, exclusion criteria based on ECG intervals were added and analyses of ECG intervals were specified. 2. Protocol Amendment 2 also introduced a 24-week observational period into the study design. Participants will enter this longer observation period after 3 weeks of voxelotor at the maximum tolerated dose (MTD) or 3000mg daily, followed by a 28 day safety follow-up period. The longer observational period coincides with the 24-week duration of treatment in the pivotal trial for voxelotor in order to establish efficacy and safety for a similar period of time.

    Interruptions (globally)

    Were there any global interruptions to the trial? Yes
    Date
    Interruption
    Restart date
    08 Jun 2021
    Due to events arising from COVID-19 Pandemic and the challenges to recruitment, the Sponsor took the decision to halt further recruitment from February 2021, at that time three patients were ongoing study treatment. Following consultation with the patient's primary consultant and the Principal Investigator in collaboration with the Sponsor, it was determined to permit ongoing patients to continue their treatment with the study drug per the protocol due to clinical benefit. It was declared that the date of the last subject last visit occurred on 08 June 2021.
    -

    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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    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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