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    Clinical Trial Results:
    A Randomized, Double-Blind, Placebo-Controlled Study With an Open-Label Extension to Evaluate the Efficacy and Safety of Avatrombopag for the Treatment of Chemotherapy-Induced Thrombocytopenia in Subjects With Active Non-Hematological Cancers

    Summary
    EudraCT number
    2018-000023-13
    Trial protocol
    HU   PL  
    Global end of trial date
    24 Jan 2023

    Results information
    Results version number
    v1(current)
    This version publication date
    21 Oct 2023
    First version publication date
    21 Oct 2023
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    AVA-CIT-330
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT03471078
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    Sobi Inc.
    Sponsor organisation address
    240 Leigh Farm Rd, Durham, United States, 27707
    Public contact
    Clinical Development, Sobi Inc, +1 7817867370, naclinical@sobi.com
    Scientific contact
    Clinical Development, Sobi Inc., +1 7817867370, naclinical@sobi.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
    28 Aug 2023
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    24 Jan 2023
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    To evaluate the efficacy of avatrombopag in increasing platelet counts and therefore preventing the need for a platelet transfusion or chemotherapy dose reduction or delay in subjects with CIT.
    Protection of trial subjects
    The study was in compliance with the ethical principles derived from the Declaration of Helsinki and the International Conference on Harmonization (ICH) and Good Clinical Practice (GCP) guidelines. All the local regulatory requirements pertinent to safety of trial subjects were also followed during the conduct of the trial.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    25 Jun 2018
    Long term follow-up planned
    Yes
    Long term follow-up rationale
    Safety, Regulatory reason
    Long term follow-up duration
    5 Years
    Independent data monitoring committee (IDMC) involvement?
    Yes
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    Poland: 7
    Country: Number of subjects enrolled
    Hungary: 15
    Country: Number of subjects enrolled
    China: 8
    Country: Number of subjects enrolled
    Russian Federation: 30
    Country: Number of subjects enrolled
    Serbia: 16
    Country: Number of subjects enrolled
    Ukraine: 32
    Country: Number of subjects enrolled
    United States: 14
    Worldwide total number of subjects
    122
    EEA total number of subjects
    22
    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)
    72
    From 65 to 84 years
    50
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    -

    Pre-assignment
    Screening details
    To be eligible for the study, subjects must have experienced thrombocytopenia during their current chemotherapy regimen. Subjects must have been screened ≤28 days prior to the Baseline Visit, unless the Screening and Baseline Visits were performed on the same day, and the subject began treatment during cycle.

    Period 1
    Period 1 title
    Overall Study (overall period)
    Is this the baseline period?
    Yes
    Allocation method
    Randomised - controlled
    Blinding used
    Double blind
    Roles blinded
    Subject, Investigator, Monitor, Data analyst, Carer

    Arms
    Are arms mutually exclusive
    Yes

    Arm title
    Avatrombopag
    Arm description
    -
    Arm type
    Experimental

    Investigational medicinal product name
    avatrombopag
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    60 mg avatrombopag or matching placebo administered orally once daily for 5 days prior to Chemotherapy Day and for 5 days immediately following Chemotherapy Day

    Arm title
    Placebo
    Arm description
    -
    Arm type
    Placebo

    Investigational medicinal product name
    Placebo Comparator Tablet
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Tablet
    Routes of administration
    Oral use
    Dosage and administration details
    60 mg avatrombopag or matching placebo administered orally once daily for 5 days prior to Chemotherapy Day and for 5 days immediately following Chemotherapy Day

    Number of subjects in period 1
    Avatrombopag Placebo
    Started
    82
    40
    Completed
    61
    34
    Not completed
    21
    6
         Adverse event, serious fatal
    2
    -
         Consent withdrawn by subject
    9
    1
         Physician decision
    3
    2
         Adverse event, non-fatal
    4
    1
         Undetermined
    3
    2

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Avatrombopag
    Reporting group description
    -

    Reporting group title
    Placebo
    Reporting group description
    -

    Reporting group values
    Avatrombopag Placebo Total
    Number of subjects
    82 40 122
    Age categorical
    Units: Subjects
        In utero
    0
        Preterm newborn infants (gestational age < 37 wks)
    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)
    0
        From 65-84 years
    0
        85 years and over
    0
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    61.0 ( 10.08 ) 60.8 ( 10.41 ) -
    Gender categorical
    Units: Subjects
        Female
    43 22 65
        Male
    39 18 57
    ECOG Performance Status
    The Eastern Cooperative Oncology Group (ECOG) performance status score describes a patient's level of functioning in terms of their ability to care for themself, daily activity, and physical ability (walking, working, etc.). 0=Fully active, able to carry on all pre-disease performance without restriction 1=Restricted in physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature, e.g., light house work, office work 2=Ambulatory and capable of all selfcare but unable to carry out any work activities; up and about more than 50% of waking hours
    Units: Subjects
        ECOG Score 0
    21 8 29
        ECOG Score 1
    60 31 91
        ECOG Score 2
    1 1 2
    Number of Eligible Chemotherapy Agents Currently Receiving per IWRS
    Units: Subjects
        Receiving 1 Agent
    40 20 60
        Receiving ≥ 2 Agents
    42 20 62

    End points

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    End points reporting groups
    Reporting group title
    Avatrombopag
    Reporting group description
    -

    Reporting group title
    Placebo
    Reporting group description
    -

    Primary: Percentage of Subjects Who do Not Require Platelet Transfusion, Dose Reduction in Chemotherapy by 15%, or Chemotherapy Delay by >=4 Days

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    End point title
    Percentage of Subjects Who do Not Require Platelet Transfusion, Dose Reduction in Chemotherapy by 15%, or Chemotherapy Delay by >=4 Days
    End point description
    End point type
    Primary
    End point timeframe
    Randomization up to 33 days
    End point values
    Avatrombopag Placebo
    Number of subjects analysed
    82
    40
    Units: Count of Participants
    57
    29
    Statistical analysis title
    Primary Efficacy Responder Criteria
    Statistical analysis description
    Primary efficacy responders are subjects who meet all of the following criteria during the period after post-chemotherapy study drug treatment in Cycle X+1 through Chemotherapy Day of Cycle X+2: not requiring a platelet transfusion; not requiring a chemotherapy dose reduction by ≥15% due to thrombocytopenia; not requiring a chemotherapy delay by ≥4 days in Cycle X+2
    Comparison groups
    Avatrombopag v Placebo
    Number of subjects included in analysis
    122
    Analysis specification
    Pre-specified
    Analysis type
    other
    P-value
    = 0.7186
    Method
    Cochran-Mantel-Haenszel
    Parameter type
    Mean difference (final values)
    Point estimate
    -3
    Confidence interval
         level
    95%
         sides
    2-sided
         lower limit
    -21.7
         upper limit
    15.6
    Variability estimate
    Standard deviation

    Secondary: Duration of severe thrombocytopenia defined as a platelet count <50 x 10^9/L

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    End point title
    Duration of severe thrombocytopenia defined as a platelet count <50 x 10^9/L
    End point description
    The duration of severe thrombocytopenia is defined as the total number of days with a platelet count <50×10^9/L during the period after post-chemotherapy study drug treatment in Cycle X+1 through Chemotherapy Day of Cycle X+2.
    End point type
    Secondary
    End point timeframe
    Randomization up to 33 days
    End point values
    Avatrombopag Placebo
    Number of subjects analysed
    81
    40
    Units: Days
        arithmetic mean (standard deviation)
    4.6 ( 5.53 )
    4.7 ( 6.56 )
    Statistical analysis title
    Duration of Severe Thrombocytopenia
    Comparison groups
    Avatrombopag v Placebo
    Number of subjects included in analysis
    121
    Analysis specification
    Pre-specified
    Analysis type
    other
    P-value
    = 0.8372
    Method
    Van Elteren Test
    Confidence interval

    Secondary: Change in platelet count from baseline (nadir)

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    End point title
    Change in platelet count from baseline (nadir)
    End point description
    Comparison of avatrombopag 60 mg vs. placebo, adjusted for the number of chemotherapy agents currently receiving per IWRS (1, ≥2). Cycle X nadir is defined as the lowest platelet count value prior to the first dose of study drug; Cycle X+1 nadir is defined as the lowest platelet count value during the period after post-chemotherapy study drug treatment in Cycle X+1 through Chemotherapy Day in Cycle X+2.
    End point type
    Secondary
    End point timeframe
    Randomization up to 33 days
    End point values
    Avatrombopag Placebo
    Number of subjects analysed
    82
    40
    Units: Platelets x 10^9/L
        arithmetic mean (standard deviation)
    51.5 ( 61.85 )
    29.1 ( 39.48 )
    Attachments
    Mean Platelet Counts Over Time
    No statistical analyses for this end point

    Secondary: Percentage of subjects who did not have major or non-major clinically relevant bleeding during the period after post-chemotherapy study drug treatment in Cycle X+1 through Chemotherapy Day of Cycle X+2.

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    End point title
    Percentage of subjects who did not have major or non-major clinically relevant bleeding during the period after post-chemotherapy study drug treatment in Cycle X+1 through Chemotherapy Day of Cycle X+2.
    End point description
    End point type
    Secondary
    End point timeframe
    Randomization up to 33 days
    End point values
    Avatrombopag Placebo
    Number of subjects analysed
    82
    40
    Units: Count of Participants
    82
    40
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    Adverse event data were collected during the Double-Blind Treatment Phase and included two 21- or 28-day chemotherapy cycles
    Adverse event reporting additional description
    Adverse events were assessed by Investigators at each study visit.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    23.0
    Reporting groups
    Reporting group title
    Avatrombopag
    Reporting group description
    -

    Reporting group title
    Placebo
    Reporting group description
    -

    Serious adverse events
    Avatrombopag Placebo
    Total subjects affected by serious adverse events
         subjects affected / exposed
    16 / 82 (19.51%)
    8 / 40 (20.00%)
         number of deaths (all causes)
    2
    0
         number of deaths resulting from adverse events
    Investigations
    Blood lactate dehydrogenase increased
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Vascular disorders
    Capillary leak syndrome
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Nervous system disorders
    Ischaemic cerebral infarction
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    1 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Lacunar infarction
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Cerebral ischaemia
         subjects affected / exposed
    0 / 82 (0.00%)
    1 / 40 (2.50%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Blood and lymphatic system disorders
    Thrombocytopenia
         subjects affected / exposed
    4 / 82 (4.88%)
    4 / 40 (10.00%)
         occurrences causally related to treatment / all
    0 / 4
    0 / 4
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Pancytopenia
         subjects affected / exposed
    3 / 82 (3.66%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 3
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Anaemia
         subjects affected / exposed
    1 / 82 (1.22%)
    2 / 40 (5.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Febrile neutropenia
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 1
    0 / 0
    Leukopenia
         subjects affected / exposed
    1 / 82 (1.22%)
    1 / 40 (2.50%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Leukocytosis
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Neutropenia
         subjects affected / exposed
    0 / 82 (0.00%)
    2 / 40 (5.00%)
         occurrences causally related to treatment / all
    0 / 0
    0 / 2
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Gastrointestinal disorders
    Stomatitis
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Respiratory, thoracic and mediastinal disorders
    non-small cell lun
         subjects affected / exposed
    1 / 82 (1.22%)
    0 / 40 (0.00%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 0
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Infections and infestations
    Pneumonia
         subjects affected / exposed
    1 / 82 (1.22%)
    1 / 40 (2.50%)
         occurrences causally related to treatment / all
    0 / 1
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Avatrombopag Placebo
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    71 / 82 (86.59%)
    36 / 40 (90.00%)
    Blood and lymphatic system disorders
    Anaemia
         subjects affected / exposed
    32 / 82 (39.02%)
    21 / 40 (52.50%)
         occurrences all number
    53
    53
    Leukopenia
         subjects affected / exposed
    24 / 82 (29.27%)
    15 / 40 (37.50%)
         occurrences all number
    39
    39
    Neutropenia
         subjects affected / exposed
    24 / 82 (29.27%)
    17 / 40 (42.50%)
         occurrences all number
    41
    41
    Thrombocytopenia
         subjects affected / exposed
    15 / 82 (18.29%)
    13 / 40 (32.50%)
         occurrences all number
    28
    28
    Thrombocytosis
         subjects affected / exposed
    9 / 82 (10.98%)
    2 / 40 (5.00%)
         occurrences all number
    11
    11
    General disorders and administration site conditions
    Asthenia
         subjects affected / exposed
    5 / 82 (6.10%)
    4 / 40 (10.00%)
         occurrences all number
    9
    9
    Fatigue
         subjects affected / exposed
    3 / 82 (3.66%)
    3 / 40 (7.50%)
         occurrences all number
    6
    6
    Gastrointestinal disorders
    Nausea
         subjects affected / exposed
    6 / 82 (7.32%)
    6 / 40 (15.00%)
         occurrences all number
    12
    12
    Vomiting
         subjects affected / exposed
    5 / 82 (6.10%)
    0 / 40 (0.00%)
         occurrences all number
    5
    5
    Respiratory, thoracic and mediastinal disorders
    Epistaxis
         subjects affected / exposed
    4 / 82 (4.88%)
    2 / 40 (5.00%)
         occurrences all number
    6
    6

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    04 Apr 2019
    This protocol amendment was introduced to include an additional tumor type (small cell lung cancer), clarify the time period for the assessment of the efficacy endpoints, and clarify certain inclusion and exclusion criteria. Additionally, the amendment allowed the Screening and Baseline Visits to be combined and performed on the same day and increased the window for a separate Screening Visit to 28 days.

    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

    Online references

    http://www.ncbi.nlm.nih.gov/pubmed/35240074
    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
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