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    Clinical Trial Results:
    A Phase 2a, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy and Safety of ANB019 in the Treatment of Acneiform Rash in Subjects with Neoplasm Receiving EGFRi or MEKi Therapy

    Summary
    EudraCT number
    2020-003494-22
    Trial protocol
    PL   CZ   LV   BG   HU  
    Global end of trial date
    13 Dec 2021

    Results information
    Results version number
    v1(current)
    This version publication date
    20 Jan 2023
    First version publication date
    20 Jan 2023
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    ANB019-207
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT04697069
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    AnaptysBio, Inc
    Sponsor organisation address
    10770 Wateridge Circle, Suite 210, San Diego, CA, United States, 92121
    Public contact
    Bruce Randazzo, AnaptysBio Inc., 001 (858) 362-6343, brandazzo@anaptysbio.com
    Scientific contact
    Bruce Randazzo, AnaptysBio Inc., 001 (858) 362-6343, brandazzo@anaptysbio.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
    13 Dec 2021
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    13 Dec 2021
    Was the trial ended prematurely?
    Yes
    General information about the trial
    Main objective of the trial
    To assess the efficacy of imsidolimab (ANB019) compared with placebo in the reduction of acneiform rash in participants receiving epidermal growth factor receptor inhibitor (EGFRi) or mitogen-activated protein (MAP)/extracellular signal-regulated kinase (ERK) kinase inhibitor (MEKi) therapy as measured by the facial inflammatory lesion count.
    Protection of trial subjects
    This study was performed in compliance with ethical principles that have their origin in the Declaration of Helsinki and that are consistent with Good Clinical Practice (GCP) and the applicable laws and regulations.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    04 May 2021
    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
    Poland: 1
    Country: Number of subjects enrolled
    Czechia: 1
    Country: Number of subjects enrolled
    Georgia: 2
    Worldwide total number of subjects
    4
    EEA total number of subjects
    2
    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)
    3
    From 65 to 84 years
    1
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    Participants with neoplasms who were receiving epidermal growth factor inhibitors or mitogen-activated protein/extracellular signal regulated kinase inhibitor were enrolled into the study.

    Pre-assignment
    Screening details
    11 participants were screened for eligibility and 4 participants were randomized into the study.

    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, Carer, Assessor
    Blinding implementation details
    The Sponsor, Investigator, and participants were blinded to treatment assignment of imsidolimab or placebo. An unblinded pharmacist was responsible for study treatment dispensing.

    Arms
    Are arms mutually exclusive
    Yes

    Arm title
    Imsidolimab
    Arm description
    Participants received a starting dose of 400 milligrams (mg) of imsidolimab on Day 1 followed by 200 mg imsidolimab every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.
    Arm type
    Experimental

    Investigational medicinal product name
    Imsidolimab
    Investigational medicinal product code
    ANB019
    Other name
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    Imsidolimab was administered by clinic staff trained in best practices for subcutaneous administration at starting dose of on Day 1 followed by 200 mg imsidolimab every 4 weeks (Days 29, 57 and 85).

    Arm title
    Placebo
    Arm description
    Participants received imsidolimab matching placebo on Day 1 and thereafter, every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.
    Arm type
    Placebo

    Investigational medicinal product name
    Placebo
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    Placebo matched to imsidolimab was administered by clinic staff trained in best practices for subcutaneous administration on Days 1, 29, 57 and 85.

    Number of subjects in period 1
    Imsidolimab Placebo
    Started
    2
    2
    Completed
    0
    0
    Not completed
    2
    2
         Study termination
    2
    1
         Withdrew consent
    -
    1

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Imsidolimab
    Reporting group description
    Participants received a starting dose of 400 milligrams (mg) of imsidolimab on Day 1 followed by 200 mg imsidolimab every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.

    Reporting group title
    Placebo
    Reporting group description
    Participants received imsidolimab matching placebo on Day 1 and thereafter, every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.

    Reporting group values
    Imsidolimab Placebo Total
    Number of subjects
    2 2 4
    Age categorical
    Units: Subjects
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    50.0 ± 9.90 65.0 ± 2.83 -
    Gender categorical
    Units: Subjects
        Female
    1 0 1
        Male
    1 2 3
    Ethnicity
    Units: Subjects
        Hispanic or Latino
    0 0 0
        Not Hispanic or Latino
    2 2 4
        Unknown or Not Reported
    0 0 0
    Race
    Units: Subjects
        White
    2 2 4

    End points

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    End points reporting groups
    Reporting group title
    Imsidolimab
    Reporting group description
    Participants received a starting dose of 400 milligrams (mg) of imsidolimab on Day 1 followed by 200 mg imsidolimab every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.

    Reporting group title
    Placebo
    Reporting group description
    Participants received imsidolimab matching placebo on Day 1 and thereafter, every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.

    Primary: Change From Baseline in Facial Inflammatory Lesion Count (Papules and Pustules) at Week 8

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    End point title
    Change From Baseline in Facial Inflammatory Lesion Count (Papules and Pustules) at Week 8 [1]
    End point description
    The number of facial inflammatory lesions (papules and pustules) on the face (excluding the neck and scalp area) was counted. Papule was a small, solid elevation 5 millimeters (mm) or less in diameter. Pastule was a small, circumscribed elevation of the skin that contains yellow-white exudate. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Primary
    End point timeframe
    Baseline, Week 8
    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 analysis was performed for the primary endpoint. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [2]
    0 [3]
    Units: lesion count
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [2] - Due to early study termination, no participant was evaluated
    [3] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline in Facial Inflammatory Lesion Count (Papules and Pustules) at Week 8

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    End point title
    Percent Change From Baseline in Facial Inflammatory Lesion Count (Papules and Pustules) at Week 8
    End point description
    The number of facial inflammatory lesions (papules and pustules) on the face (excluding the neck and scalp area) was counted. Papule was a small, solid elevation 5 mm or less in diameter. Pastule was a small, circumscribed elevation of the skin that contains yellow-white exudate. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [4]
    0 [5]
    Units: percent change
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [4] - Due to early study termination, no participant was evaluated.
    [5] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Percentage of Participants With an Improvement of at Least 1 Grade From Baseline in Acneiform Rash Common Terminology Criteria for Adverse Events (CTCAE) Grading Scale at Week 8

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    End point title
    Percentage of Participants With an Improvement of at Least 1 Grade From Baseline in Acneiform Rash Common Terminology Criteria for Adverse Events (CTCAE) Grading Scale at Week 8
    End point description
    The acneiform rash CTCAE grading scale of severity was 6-point scale ranging from 0-5. Scale 0=no evidence of rash. Scale 1=papules and/or pustules covering <10% body surface area (BSA),which may or may not be associated with symptoms of pruritus or tenderness. Scale 2=papules and/or pustules covering 10-30% BSA, which may or may not be associated with symptoms of pruritus or tenderness; associated with psychosocial impact;limiting instrumental activities of daily living (ADL); papules and/or pustules covering >30% BSA with or without mild symptoms. Scale 3=papules and/or pustules covering >30% BSA with moderate or severe symptoms; limiting self-care ADL; associated with local superinfection with oral antibiotics. Scale 4=life-threatening consequences; papules and/or pustules covering any %BSA, which may or may not be associated with symptoms of pruritus or tenderness and are associated with extensive superinfection with intravenous (IV) antibiotics indicated. Scale 5=death
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [6]
    0 [7]
    Units: percentage of participants
        number (not applicable)
    Notes
    [6] - Due to early study termination, no participant was evaluated.
    [7] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Time to First Response of 1 Grade Improvement From Baseline on the Acneiform Rash CTCAE Grading Scale

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    End point title
    Time to First Response of 1 Grade Improvement From Baseline on the Acneiform Rash CTCAE Grading Scale
    End point description
    Time to first response of 1 grade improvement from baseline on the acneiform rash CTCAE grading scale: Date of the first response of 1 grade improvement from baseline on the acneiform rash CTCAE grading scale – Date of the first dose of study treatment (or from randomization for any participant randomized but not treated) + 1. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline up to 55 days
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [8]
    0 [9]
    Units: days
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [8] - Due to early study termination, no participant was evaluated.
    [9] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Percentage of Participants With an Improvement of at Least 1 Grade From Baseline in Acneiform Rash Modified Multinational Association for Supportive Care in Cancer (MASCC) EGFRi Skin Toxicity Tool (MESTT) Grading Scale (Total Score) at Week 8

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    End point title
    Percentage of Participants With an Improvement of at Least 1 Grade From Baseline in Acneiform Rash Modified Multinational Association for Supportive Care in Cancer (MASCC) EGFRi Skin Toxicity Tool (MESTT) Grading Scale (Total Score) at Week 8
    End point description
    The MESTT grading scale of the acneiform rash severity was a 3-point scale ranging from 1 to 3: Scale 1 = 1A: papules or pustules ≤5; OR 1 area of erythema or edema <1 centimeter (cm) in size. 1B: papules or pustules ≤5; OR 1 area of erythema or edema <1 cm in size; AND pain or pruritus. Scale 2 = 2A: papules or pustules 6-20; OR 2-5 areas of erythema or edema <1 cm in size. 2B: Papules or pustules 6-20; OR 2-5 areas of erythema or edema <1 cm in size; AND pain, pruritus, or effect on emotions or functioning. Scale 3 = 3A: papules or pustules > 20; OR more than 5 areas of erythema or edema <1 cm in size. 3B: papules or pustules > 20; OR more than 5 areas of erythema or edema <1 cm in size; AND pain, pruritus, or effect on emotions or functioning. Grading was performed individually for the face, scalp, chest, and back. The sum of all body region scores yielded the total score (range: 4 to 12).
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [10]
    0 [11]
    Units: percentage of participants
        number (not applicable)
    Notes
    [10] - Due to early study termination, no participant was evaluated.
    [11] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Time to First Response of 1 Grade Improvement From Baseline on the Acneiform Rash Modified MESTT Grading Scale (Total Score)

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    End point title
    Time to First Response of 1 Grade Improvement From Baseline on the Acneiform Rash Modified MESTT Grading Scale (Total Score)
    End point description
    Time to first response of 1 grade improvement from baseline on the acneiform rash modified MESTT grading scale (total score): Date of onset of the first response of 1 grade improvement from baseline on the acneiform rash modified MESTT grading scale (total score) – Date of the first dose of study treatment (or from randomization for any participant randomized but not treated) + 1. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline to 55 days
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [12]
    0 [13]
    Units: days
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [12] - Due to early study termination, no participant was evaluated.
    [13] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Percentage of Participants With an Improvement of at Least 1 Grade From Baseline in Acneiform Rash Modified MESTT Grading Scale (Facial Assessment) at Week 8

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    End point title
    Percentage of Participants With an Improvement of at Least 1 Grade From Baseline in Acneiform Rash Modified MESTT Grading Scale (Facial Assessment) at Week 8
    End point description
    The MESTT grading scale of the acneiform rash severity was a 3-point scale ranging from 1 to 3: Scale 1 = 1A: papules or pustules ≤5; OR 1 area of erythema or edema <1cm in size. 1B: papules or pustules ≤5; OR 1 area of erythema or edema <1 cm in size; AND pain or pruritus. Scale 2 = 2A: papules or pustules 6-20; OR 2-5 areas of erythema or edema <1 cm in size. 2B: Papules or pustules 6-20; OR 2-5 areas of erythema or edema <1 cm in size; AND pain, pruritus, or effect on emotions or functioning. Scale 3 = 3A: papules or pustules > 20; OR more than 5 areas of erythema or edema <1 cm in size. 3B: papules or pustules > 20; OR more than 5 areas of erythema or edema <1 cm in size; AND pain, pruritus, or effect on emotions or functioning. Grading was performed individually for the face. The score ranged from 1 to 3.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [14]
    0 [15]
    Units: percentage of participants
        number (not applicable)
    Notes
    [14] - Due to early study termination, no participant was evaluated.
    [15] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Time to First Response of 1 Grade Improvement From Baseline on the Acneiform Rash Modified MESTT Grading Scale (Facial Assessment)

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    End point title
    Time to First Response of 1 Grade Improvement From Baseline on the Acneiform Rash Modified MESTT Grading Scale (Facial Assessment)
    End point description
    Time to first response of 1 grade improvement from baseline on the acneiform rash modified MESTT grading scale (facial assessment): Date of onset of the first response of 1 grade improvement from baseline on the acneiform rash modified MESTT grading scale (facial assessment) – Date of the first dose of study treatment (or from randomization for any participant randomized but not treated) + 1. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline to 55 days
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [16]
    0 [17]
    Units: days
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [16] - Due to early study termination, no participant was evaluated.
    [17] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Change From Baseline in Pruritus Numeric Rating Scale (NRS) at Week 8

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    End point title
    Change From Baseline in Pruritus Numeric Rating Scale (NRS) at Week 8
    End point description
    The intensity of pruritus was evaluated by asking participants to assign a numerical score representing the worst intensity over the last 24 hours of their symptoms on a scale from 0 to 10, with 0 indicating no itch and 10 indicating the worst imaginable itch. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [18]
    0 [19]
    Units: units on a scale
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [18] - Due to early study termination, no participant was evaluated.
    [19] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline in Pruritus NRS at Week 8

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    End point title
    Percent Change From Baseline in Pruritus NRS at Week 8
    End point description
    The intensity of pruritus was evaluated by asking participants to assign a numerical score representing the worst intensity over the last 24 hours of their symptoms on a scale from 0 to 10, with 0 indicating no itch and 10 indicating the worst imaginable itch. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [20]
    0 [21]
    Units: percent change
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [20] - Due to early study termination, no participant was evaluated.
    [21] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Change From Baseline in Pain NRS at Week 8

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    End point title
    Change From Baseline in Pain NRS at Week 8
    End point description
    The intensity of pain was evaluated by asking participants to assign a numerical score representing the worst intensity over the last 24 hours of their symptoms on a scale from 0 to 10, with 0 indicating no pain and 10 indicating the worst imaginable pain. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [22]
    0 [23]
    Units: units on a scale
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [22] - Due to early study termination, no participant was evaluated.
    [23] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline in Pain NRS at Week 8

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    End point title
    Percent Change From Baseline in Pain NRS at Week 8
    End point description
    The intensity of pain was evaluated by asking participants to assign a numerical score representing the worst intensity over the last 24 hours of their symptoms on a scale from 0 to 10, with 0 indicating no pain and 10 indicating the worst imaginable pain. Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [24]
    0 [25]
    Units: percent change
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [24] - Due to early study termination, no participant was evaluated.
    [25] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Change From Baseline in Functional Assessment of Cancer Therapy - Epidermal Growth Factor Receptor Inhibitor 18 (FACT-EGFRi-18) at Week 8

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    End point title
    Change From Baseline in Functional Assessment of Cancer Therapy - Epidermal Growth Factor Receptor Inhibitor 18 (FACT-EGFRi-18) at Week 8
    End point description
    The FACT-EGFRi-18 was an 18-item likert-scaled questionnaire, arranged in three dimensions: physical (seven items), social/emotional (six items), and functional well-being (five items). The response scores ranged from 0 (not at all) to 4 (very much). The total score was obtained by multiplying the sum of the subscale by the number of items in the scale (18), and then dividing by the number of items actually answered. The total score ranged from 0-72 with a higher score represented a high level of symptomatology (problems). Due to early study termination, no participant was evaluated in the imsidolimab group and 1 participant was evaluated in the placebo group. Since only 1 participant was evaluated, results were not reported for the protection of personal data and to avoid re-identification.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 8
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    0 [26]
    0 [27]
    Units: units on a scale
        arithmetic mean (standard deviation)
    ±
    ±
    Notes
    [26] - Due to early study termination, no participant was evaluated.
    [27] - Only 1 participant was evaluated. Results were not reported for the protection of personal data.
    No statistical analyses for this end point

    Secondary: Number of Participants With Treatment-Emergent Adverse Events

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    End point title
    Number of Participants With Treatment-Emergent Adverse Events
    End point description
    An adverse event (AE) was any untoward medical occurrence in a participant temporally associated with the use of a study treatment, whether or not considered related to study treatment. An AE could therefore be any unfavorable and unintended sign (including abnormal laboratory finding), symptom, or disease temporally associated with use of study treatment that did not necessarily have a causal relationship with this treatment. An AE was considered "serious" if there was any of the following outcomes: death, life-threatening, Inpatient hospitalization or prolongation of existing hospitalization, persistent or significant incapacity or substantial disruption of ability to conduct normal life functions, congenital anomaly/birth defect, other important medical events. An AE was considered treatment-emergent if the date of onset was during or after first dose of study treatment, or if the AE present at baseline worsened in either intensity or frequency after first dose of study treatment.
    End point type
    Secondary
    End point timeframe
    From first dose to 55 days
    End point values
    Imsidolimab Placebo
    Number of subjects analysed
    2
    2
    Units: participants
        Any TEAEs
    0
    2
        Serious TEAEs
    0
    0
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    From first dose to 55 days
    Adverse event reporting additional description
    Safety analysis set included all randomized participants who received at least 1 dose of imsidolimab or placebo.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    24.1
    Reporting groups
    Reporting group title
    Imsidolimab
    Reporting group description
    Participants received a starting dose of 400 mg of imsidolimab on Day 1 followed by 200 mg imsidolimab every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.

    Reporting group title
    Placebo
    Reporting group description
    Participants received imsidolimab matching placebo on Day 1 and thereafter, every 4 weeks (Days 29, 57 and 85) by subcutaneous injection.

    Serious adverse events
    Imsidolimab Placebo
    Total subjects affected by serious adverse events
         subjects affected / exposed
    0 / 2 (0.00%)
    0 / 2 (0.00%)
         number of deaths (all causes)
    0
    0
         number of deaths resulting from adverse events
    0
    0
    Frequency threshold for reporting non-serious adverse events: 0%
    Non-serious adverse events
    Imsidolimab Placebo
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    0 / 2 (0.00%)
    2 / 2 (100.00%)
    Investigations
    Electrocardiogram T wave inversion
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Gastrointestinal disorders
    Diarrhoea
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1
    Metabolism and nutrition disorders
    Hypokalaemia
         subjects affected / exposed
    0 / 2 (0.00%)
    1 / 2 (50.00%)
         occurrences all number
    0
    1

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    11 Feb 2021
    This amendment was prepared to address the following issues: 1) Permit small editorial changes for correctness. 2) Clarify modifications to MESTT, use of CTCAE scoring and corresponding statistical analysis. 3) Permit (optional) home health visits during the COVID-19 pandemic, describe home nursing visit procedures, and acknowledge that COVID-19 measures only apply if they are in accordance with current, locally-applicable recommendations/regulations. 4) Permit the use of remaining serum from samples collected for PK/immunogenicity endpoints to be retained for assay method development, troubleshooting, or validation. 5) Clarify timing for administration of live attenuated vaccines after the participant completes the 12-week standard safety follow-up period of the study or after 12 weeks following the last administration of the study drug for participant who discontinued from the study early. 6) Clarify timing requirements for use of hormonal contraceptives prior to and during study participation and to identify which oral hormonal contraceptives are permissible. 7) Permit enrolment of participants treated with any commercially-available EGFRi or MEKi therapy. 8) Include a 30-minute observation period of study participants after application of each dose of imsidolimab to identify any potential allergic/anaphylactic reaction. 9) Clarify timing of anti-drug antibody sample collection.
    05 Aug 2021
    This amendment was prepared to address the following issues: 1) Permit small editorial changes for clarity and correctness. 2) Update the name of the Sponsor medical expert and signatory, and address of the Sponsor. 3) Allow inclusion of participants with benign neoplasm (not cancer). 4) Revised eligibility criteria for body weight to ≥40kg. 5) Updated tuberculosis screening as inclusion criteria. 6) Clarified definition of childbearing potential in contraceptive use exclusion criteria. 7) Allow screening of participants prior to rash onset. 8) Reduce the number of study visits by removing Week 1 and Week 6 visits. 9) Modify the list of study endpoints by removing percent change from baseline from some endpoints and revised exploratory endpoints based on planned data collection. 10) Clarify the recommended order of assessments to be followed during the study visits. 11) Add an evaluation of the Fitzpatrick Skin Type Classification. 12) Reduce the number of electrocardiograms (ECGs) to be performed during the study. 13) Reduce the number of tape strip samples to be collected and clarify the location for sample collection. 14) Reduce the number of blood samples to be collected for pharmacokinetic (PK) evaluations. 15) Removal of noncompartmental analysis (NCA) due to limited PK sampling. 16) Update washout periods for prohibited treatments. 17) Add clarification related to vaccines allowed during the study. 18) Clarify if a participant were to discontinue early from the study, an early termination visit will be required. 19) Remove the possibility of participants’ replacement. 20) Clarify assessment of facial lesions. 21) Remove facsimile as an option to report serious adverse events (SAEs). 22) Update the text to indicate local laboratory tests will be allowed at Screening for tuberculosis and viral serology testing

    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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