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

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)

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2031250053
Enrollment
211
Registered
2025-04-21
Start date
2025-08-13
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

*Dermatomyositis *Polymyositis

Interventions

*Drug: Dazukibart -anti-interferon beta therapy

Sponsors

Kawai Norisuke
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Participants that completed a qualifying study through Week 52.

Exclusion criteria

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.

Design outcomes

Primary

MeasureTime frame
*Treatment-Emergent Adverse Events (AEs), Serious AEs, AEs of Special Interest, and AEs leading to treatment discontinuation *Number of participants with clinically significant laboratory abnormalities *Number of participants with clinically significant abnormalities in vital signs *Number of participants with clinically significant electrocardiogram (ECG) abnormalities *Change from baseline in Forced Vital Capacity (FVC)/Diffusing Capacity of the Lungs for Carbon Monoxide (DLCO) *Absolute values and change from baseline in Columbia-Suicide Severity Rating Scale (C-SSRS)

Secondary

MeasureTime frame
*Change from baseline in Manual Muscle Testing - 8 designated muscles (MMT-8) *Change from baseline in Physician Global Activity (PhGA) *Change from baseline in extramuscular activity or disease activity score and muscle enzyme results *Minimal, Moderate, and Major improvement in Total Improvement Score (TIS) and TIS (continuous) score *Percent change from baseline and change from baseline in Cutaneous Dermatomyositis Disease Area and Severity Index Activity Score (CDASI-A) in DM participants *Change from baseline in Cutaneous Dermatomyositis Disease Area and Severity Index Damage Score (CDASI-D) in DM participants *Change from baseline in Patient-Reported Outcomes Measurement Information System - Physical Function (PROMIS-PF) *Change from baseline in Patient Global Activity (PtGA) *Change from baseline in Health Assessment Questionnaire-Disability Index (HAQ-DI) *Change from baseline in Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F) *Change from baseline in EuroQoL 5 Dimensions (EQ-5D-5L) and EuroQoL Visual Analog Scale (EQ-VAS) *Change from baseline in Healthcare Resource Utilization Questionnaire (HRU) *Change from baseline in 5-D Itch Scale Score in DM participants *Change from baseline in corticosteroid (CS) and non-steroid immunosuppressant/immunomodulator and antimalarial dose -CS and non-steroid immunosuppressant/immunomodulator and antimalarial dose *Response in CS and non-steroid immunosuppressant/immunomodulator and antimalarial tapering *Rescue therapy use assessment *Auto antibodies and immunogenicity presence

Countries

Argentina, Bulgaria, China, Hungary, India, Israel, Japan, Mexico, Poland, Taiwan, Turkey, United States

Contacts

Public ContactClinical Trials Information Desk

Pfizer R&D Japan G.K.

clinical-trials@pfizer.com+81-3-5309-7000

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026