A Study to Understand How the Study Medicine (PF-06823859) Works in People With Active Idiopathic Inflammatory Myopathies [Dermatomyositis (DM) and Polymyositis (PM)]

Recruiting now · Phase 3 · Has a placebo group

Conditions studied: Myositis

In brief

The purpose of the study is to understand how the study medicine PF-06823859 (dazukibart) works in people with idiopathic inflammatory myopathies (DM and PM). These disorders cause inflammation that weakens the muscles that are important for movement and may also cause skin rash in people with DM. This study is seeking participants who: * Are 18 years of age or older or minimum legal adult age as defined per local regulation, whichever is greater * Have active DM or active PM. * Are receiving a stable dose of 1 corticosteroid taken by mouth and/or 1 traditional immunosuppressant. * Note: Corticosteroids and immunosuppressants are medicines that help reduce inflammation and may signal to the immune system not to attack the body. Dermatomyositis (DM) is a rare disease that causes muscle inflammation that results in muscle weakness and low muscle stamina. Patients with DM have a characteristic skin rash. Polymyositis (PM) is a rare disease that involves mainly muscle inflammation resulting in muscle weakness, that can sometimes be painful. Patients with DM and PM may have trouble going up the steps, walking or getting to a standing position. Some of the participants will receive the study medicine (dazukibart) and some will receive placebo (which is similar to study medicine but contains no medicine in it). The study medicine or placebo will be given as an intravenous (IV) infusion (directly into the veins), which takes about 1 hour; every 4 weeks from Day 1 to Week 48 of the study. Both dazukibart and placebo and will be given at the study site. The study will compare the experiences of people receiving study medication to those of the people who do not. This will help to see if dazukibart is safe and effective. Participants will take part in this study for about 13 months. During this time, participants will have 15 study visits. These visits will be performed at the study site.

Key facts

Study ID

NCT05895786

Run by

Pfizer

People needed

318

Starts

2023-05-20

Expected to finish

2027-07-28

Last updated by the study team

2026-06-01

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Male or female adults (≥18 years old or minimum legal adult age as defined per local regulation, whichever is greater)
• Active dermatomyositis (DM) or polymyositis (PM) with age of onset
• 18 years old.
• Must be receiving a stable dose of standard of care (SOC) background medications at the time of enrollment.

You may not qualify if…

• Myositis due to non-Idiopathic inflammatory myopathies (non-IIM)
• Existing diagnosis of inclusion body myositis (IBM)
• Presence of immune-mediated necrotizing myositis (IMNM)
• Myositis with end-stage organ involvement
• Active bacterial, viral or fungal infections or hospitalizations for serious infections within 60 days prior to enrollment
• History of recurrent bacterial, viral, fungal, mycobacterial or other infections
• Clinically significant finding on a chest x-ray
• Have cancer or a history of cancer within 5 years of screening
• Significant current or prior disease conditions that may interfere with the response to or safety of the study medicine, including but not limited to:
• history of major organ transplant
• acute coronary syndrome or any history of significant cerebrovascular disease within 24 weeks of screening
• preexisting demyelinating disorder such as multiple sclerosis, or other severe neurological disorder
• major surgery within 4 weeks of screening, or scheduled to occur during the study, excluding diagnostic surgery
• previous treatment with total lymphoid irradiation
• history of any lymphoproliferative disorder such as Epstein Barr Virus, history of lymphoma, leukemia, or symptoms of current lymphatic or lymphoid disease
• Clinically significant depression, suicidal ideation, or previous history of suicidal behaviors
• Other medical or laboratory abnormality that may increase the risk of study participation
• Previous administration with an investigational product (drug or vaccine) within 30 days or of the first dose of study medicine
• Current use or incomplete appropriate washout period of any prohibited medication(s) or known exposure to anti-interferon beta (PF-06823859) or any type of anti-interferon beta therapy
• Prior SOC medication that does not fulfill the criteria
• Certain laboratory results from screening assessments that may interfere with study participation.
• Investigator site staff directly involved in the conduct of the study and their family members, site staff and sponsor and sponsor delegate employees directly involved in the conduct of the study and their family members

Where it is running

• NYU Langone Health Clinical Research Center — New York, New York, United States (enrolling)
• NYU Langone Health — New York, New York, United States (enrolling)
• Brigham and Women's Hospital — Boston, Massachusetts, United States (enrolling)
• NYU Langone Health - Clinical and Translational Science Institute Research Pharmacy — New York, New York, United States (enrolling)
• Mayo Clinic Hospital — Phoenix, Arizona, United States (enrolling)
• UCLA — Los Angeles, California, United States (enrolling)
• Mayo Clinic in Arizona - Scottsdale — Scottsdale, Arizona, United States (enrolling)
• Arizona Arthritis & Rheumatology Research, PLLC — Glendale, Arizona, United States (enrolling)
• CTC - Brigham & Women's Hospital — Boston, Massachusetts, United States (enrolling)
• CTH - Brigham & Women's Hospital — Boston, Massachusetts, United States (enrolling)
• Mayo Clinic in Florida — Jacksonville, Florida, United States (enrolling)
• UCLA Clinical & Translational Research Center (CTRC) — Los Angeles, California, United States (enrolling)
• University of Miami — Miami, Florida, United States (enrolling)
• University of Miami Dermatology Clinical Trials Unit — Miami, Florida, United States (enrolling)
• University of Miami — Miami, Florida, United States (enrolling)
• Unviversity of Miami — Miami, Florida, United States (enrolling)
• Neuromuscular Research Center — Phoenix, Arizona, United States (enrolling)
• IRIS Research and Development, LLC — Plantation, Florida, United States (enrolling)
• West Broward Pulmonary Consultants — Plantation, Florida, United States (enrolling)
• 200 UCLA Medical Plaza — Los Angeles, California, United States (enrolling)
• KU Clinical Research Center - Clinical and Translational Science Unit (CTSU) — Fairway, Kansas, United States (enrolling)
• KU Clinical Research Center - Clinical and Translational Science Unit (CTSU) Rainbow — Kansas City, Kansas, United States (enrolling)
• University of Kansas Medical Center - Hoglund Brain Imaging Center — Kansas City, Kansas, United States (enrolling)
• University of Kansas Medical Center — Kansas City, Kansas, United States (enrolling)
• NYU Langone Radiology — New York, New York, United States (enrolling)

Full record on ClinicalTrials.gov

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