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NCT Number: NCT06698796

A Study to Understand How the Study Medicine Dazukibart Works in People With Idiopathic Inflammatory Myopathies

The purpose of this study is to understand how the study medicine, dazukibart, works in people with active idiopathic inflammatory myopathies (dermatomyositis [DM] or polymyositis [PM]).

Idiopathic inflammatory myopathies are a group of disorders that show inflammation of the muscles used for movement. There are several types of idiopathic inflammatory myopathies, including DM and PM.

DM and PM involve weakness of the muscles closest to the center of the body, such as the muscles of the hips, thighs, upper arms, and neck. People with these forms of idiopathic inflammatory myopathies may find it difficult to climb stairs, get up from a seated position, or lift items above their head. People with DM can also have a skin rash.

These disorders negatively impact the quality of life and functioning of patients. In addition to the above, these disorders can affect how the lungs and heart work.

This study is seeking participants who took part in a DM and PM study with dazukibart before. Some participants will receive study medicine, and some participants will not receive study medicine and only complete safety follow-up.

The study medicine will be given as an intravenous (IV) infusion (directly into the veins). This takes about 1 hour, every 4 weeks, from Day 1 to Week 48 (about 12 months) of the study. This will be followed by a safety follow-up period that lasts about 4 months after the last infusion. Participants who receive study medicine will have about 18 study visits at the site over about 16 months.

There will also be participants enrolled in this study who will not receive study medicine. Such participants will only take part in safety follow-up visits as they do not want to or are not eligible to receive dazukibart. These participants will not receive study medicine and will have up to 4 study visits at the site every 4 weeks to complete safety follow-up.

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Key information

Conditions

Dermatomyositis Connective Tissue Diseases Muscular Diseases Musculoskeletal Diseases Myositis Nervous System Diseases Neuromuscular Diseases Polymyositis Skin Diseases Skin and Connective Tissue Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 3

Primary location

Centro de Investigaciones Médicas Tucuman, SAN M. de Tucuman, Tucumán Province, Argentina

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participants that completed a qualifying study through Week 52.

Exclusion criteria

  • Any medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation.
  • Previous administration with an investigational product (drug or vaccine) other than dazukibart in a qualifying study within 30 days (or as determined by the local requirement) or 5 half-lives preceding baseline in this study (whichever is longer).
  • Current use of any prohibited concomitant medication(s).
  • Active bacterial, viral, fungal, mycobacterial or other infections.
  • Ongoing adverse event in a qualifying study or the participant has met safety monitoring criteria in a qualifying study that have not resolved.
  • Investigator site staff or sponsor employees directly involved in the conduct of the study, site staff otherwise supervised by the investigator, and their respective family members.

Treatment and study plan

Dazukibart

Drug

anti-interferon beta therapy

Primary outcomes

  1. Treatment-Emergent Adverse Events (AEs), Serious AEs, AEs of Special Interest, and AEs leading to treatment discontinuation

    Time frame: 52 weeks

    An AE is any untoward medical occurrence in a participant who received study treatment without regard to possibility of causal relationship. SAE is an AE resulting in any of the following outcomes or deemed significant for any other reason: death, initial or prolonged inpatient hospitalization, life-threatening experience (immediate risk of dying), persistent or significant disability or incapacity, congenital anomaly. Treatment-emergent are AEs that are absent before treatment or that worsened relative to pretreatment state. Pre-defined AESI for this study are outlined in study protocol.

  2. Number of participants with clinically significant laboratory abnormalities

    Time frame: 52 weeks

    Clinically significant laboratory abnormalities are those that meet the Common Terminology Criteria for Adverse Events (CTCAE) definition.

  3. Number of participants with clinically significant abnormalities in vital signs

    Time frame: 52 weeks

    Clinically significant vital sign abnormalities include pulse rate <40, >100 or >120 bpm; systolic blood pressure increase from baseline ≥30 or decrease ≤30 mmHg; diastolic blood pressure increase from baseline ≥20 or decrease ≤20 mmHg.

  4. Number of participants with clinically significant electrocardiogram (ECG) abnormalities

    Time frame: 52 weeks

    Clinically significant ECG abnormalities include mild (>450-480 millisecond [msec]), moderate (>480-500 msec or 30-60 msec increase from baseline), and severe (>500 msec or >60 msec increase from baseline) QTc prolongation.

  5. Change from baseline in Forced Vital Capacity (FVC)/Diffusing Capacity of the Lungs for Carbon Monoxide (DLCO)

    Time frame: 52 weeks

    FVC is the volume of air which can be forcibly exhaled from the lungs after taking the deepest breath possible. DLCO is a measure of gas exchange diffusion capacity.

  6. Absolute values and change from baseline in Columbia-Suicide Severity Rating Scale (C-SSRS)

    Time frame: 52 weeks

    C-SSRS assesses whether participant experienced following: completed suicide (1), suicide attempt (2) (response of "Yes" on "actual attempt"), preparatory acts toward imminent suicidal behavior (3)("Yes" on "preparatory acts or behavior"), suicidal ideation (4) ("Yes" on "wish to be dead", "non-specific active suicidal thoughts", "active suicidal ideation with methods without intent to act or some intent to act, without specific plan or with specific plan and intent), any suicidal behavior or ideation, self-injurious behavior (7)("Yes" on "Has subject engaged in non-suicidal self-injurious behavior").

Secondary outcomes

  1. Change from baseline in Manual Muscle Testing - 8 designated muscles (MMT-8)

    Time frame: 52 weeks

    Manual Muscle Testing (8 designated muscles) 0 to 150 with higher scores indicating a better outcome

  2. Change from baseline in Physician Global Activity (PhGA)

    Time frame: 52 weeks

    Physician Global Activity 0 to 10 scale with higher scores indicating a worse outcome

  3. Change from baseline in extramuscular activity or disease activity score and muscle enzyme results

    Time frame: 52 weeks

    Results come from Total Improvement Score 0 to 100 with higher scores indicating a better outcome and laboratory values

  4. Minimal, Moderate, and Major improvement in Total Improvement Score (TIS) and TIS (continuous) score

    Time frame: 52 weeks

    Total Improvement Score 0 to 100 with higher scores indicating a better outcome.

  5. Percent change from baseline and change from baseline in Cutaneous Dermatomyositis Disease Area and Severity Index Activity Score (CDASI-A) in DM participants

    Time frame: 52 weeks

    Cutaneous Dermatomyositis Disease Area and Severity Index Activity Score 0 to 100 with higher scores indicating a worse outcome

  6. Change from baseline in Cutaneous Dermatomyositis Disease Area and Severity Index Damage Score (CDASI-D) in DM participants

    Time frame: 52 weeks

    Cutaneous Dermatomyositis Disease Area and Severity Index Damage Score 0 to 32 with higher scores indicating a worse outcome

  7. Change from baseline in Patient-Reported Outcomes Measurement Information System - Physical Function (PROMIS-PF)

    Time frame: 52 weeks

    Patient-Reported Outcomes Measurement Information System - Physical Function 0 to 100 with higher scores indicating a better outcome

  8. Change from baseline in Patient Global Activity (PtGA)

    Time frame: 52 weeks

    Patient Global Activity 10-point numeric rating scale with higher scores indicating worse outcome

  9. Change from baseline in Health Assessment Questionnaire-Disability Index (HAQ-DI)

    Time frame: 52 weeks

    Health Assessment Questionnaire-Disability Index 20 questions with 0 to 3 scale where higher scores indicate a worse outcome

  10. Change from baseline in Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F)

    Time frame: 52 weeks

    Functional Assessment of Chronic Illness Therapy - Fatigue 0 to 52 with higher scores indicating a better outcome

  11. Change from baseline in EuroQoL 5 Dimensions (EQ-5D-5L) and EuroQoL Visual Analog Scale (EQ-VAS)

    Time frame: 52 Weeks

    EuroQoL 5 Dimensions and EuroQoL Visual Analog Scale with higher scores indicating a worse outcome

  12. Change from baseline in Healthcare Resource Utilization Questionnaire (HRU)

    Time frame: 52 weeks

    Healthcare Resource Utilization Questionnaire measures the healthcare utilization burden while on treatment

  13. Change from baseline in 5-D Itch Scale Score in DM participants

    Time frame: 52 weeks

    5-D Pruritis Scale 5 to 25 with higher scores indicating a worse outcome

  14. Change from baseline in corticosteroid (CS) and non-steroid immunosuppressant/immunomodulator and antimalarial dose

    Time frame: 52 weeks

    CS and non-steroid immunosuppressant/immunomodulator and antimalarial dose

  15. Response in CS and non-steroid immunosuppressant/immunomodulator and antimalarial tapering

    Time frame: 52 weeks

    CS dose ≤5 mg/day or CS and non-steroid immunosuppressant/immunomodulator and antimalarial free

  16. Rescue therapy use assessment

    Time frame: 52 weeks

    Rescue therapy received during the study and number of cycles

  17. Auto antibodies and immunogenicity presence

    Time frame: 52 weeks

    Auto antibody lab assessment (eg. TIF1-γ/P155, NXP2/P140, SAE, JO-1 and MDA-5) and ADAs/Nabs

Study contacts

Contact information is provided by the study sponsor or research team.

Pfizer CT.gov Call Center

CONTACT

[email protected]

1-800-718-1021

Sponsors and collaborators

Lead sponsor

Pfizer

Industry

Registry information

Official study title

A PHASE 3, MULTI-CENTER, OPEN-LABEL EXTENSION STUDY TO INVESTIGATE THE LONG-TERM SAFETY, TOLERABILITY, AND EFFICACY OF DAZUKIBART IN PARTICIPANTS WITH IDIOPATHIC INFLAMMATORY MYOPATHIES (INCLUDING PARTICIPANTS WITH DERMATOMYOSITIS OR POLYMYOSITIS)

Important dates

Study start
2025
Primary completion
2027
Study completion
2027
First posted
Nov 21, 2024
Registry last updated
May 15, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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