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A Phase 3 Study of Obexelimab in Patients with IgG4-Related Disease

Phase 3
Active, not recruiting
Conditions
IgG4 Related Disease
Interventions
Other: Placebo
Registration Number
NCT05662241
Lead Sponsor
Zenas BioPharma (USA), LLC
Brief Summary

This study aims to examine the efficacy and safety of obexelimab for the prevention of flare of IgG4-related disease (IgG4-RD)

Detailed Description

This study consists of a 1-year randomized control period (RCP), followed by an additional 2-year open label extension (OLE) period.

To enter the Screening Period (Day -28 to Day -1), patients must have active IgG4-RD signs/symptoms (i.e., flare) that require steroid therapy. On Day 1, patients will be randomized in a ratio of 1:1 to receive either obexelimab or placebo administered as subcutaneous (SC) injections. All patients will begin a steroid taper on Day 1 to discontinuation by Week 8.

Patients will be monitored for flares during scheduled in clinic visits and any unscheduled visits. The primary endpoint is time to first IgG4-RD flare that requires initiation of rescue therapy in the opinion of the investigator and the Adjudication Committee (AC).

Following the 52-week RCP, patients will have the opportunity to continue in an OLE period where all patients will receive obexelimab. Patients who do not wish to enroll into the OLE period will return for an in-clinic safety follow-up visit 8 weeks after the Week 52 visit (i.e., Week 60).

Including screening and follow-up, the maximum duration of participation in this study for an individual patient is 172 weeks (i.e., 28-day screening, 52-week RCP, 104-week OLE, and an 12-week follow-up).

Recruitment & Eligibility

Status
ACTIVE_NOT_RECRUITING
Sex
All
Target Recruitment
194
Inclusion Criteria
  1. Males and females, ≥ 18 years of age
  2. Clinical diagnosis of IgG4-RD
  3. Patients must meet the 2019 ACR/EULAR Classification Criteria for IgG4-RD
  4. Patients must have active IgG4-RD signs/symptoms (i.e., flare) that require the initiation of GC therapy or the increase in background long-term GC therapy
  5. Other inclusion criteria apply
Exclusion Criteria
  1. Has disease in only 1 organ system whose primary manifestation is fibrosis
  2. Has received prednisone equivalent given orally at a dose greater than 60 mg/day within the 4 weeks prior to screening or during screening
  3. Has received a non-biologic, disease-modifying anti-rheumatological drug or immunosuppressive agent other than GCs within the 4 weeks prior to screening
  4. Has received an investigational treatment or direct medical intervention on another clinical study within 12 weeks or < 5 half-lives of the investigational treatment, whichever is shorter, prior to screening
  5. Has received live vaccine or live therapeutic infectious agent within the 2 weeks prior to screening
  6. Active tuberculosis or high risk for tuberculosis; hepatitis C infection in absence of curative treatment; evidence of hepatitis B infection
  7. Use of B cell depleting or targeting agents within 6 months of randomization
  8. Other exclusion criteria apply

Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Arm && Interventions
GroupInterventionDescription
ZB012ObexelimabObexelimab administered as an SC injection.
PlaceboPlaceboPlacebo administered as an SC injection.
Primary Outcome Measures
NameTimeMethod
Primary outcome measureRandomization to Week 52

Time to first IgG4-RD flare, defined as the reappearance of previous signs/symptoms or appearance of new signs/symptoms of IgG4-RD that requires initiation of rescue therapy in the opinion of the investigator and the Adjudication Committee (AC), from randomization to Week 52.

Secondary Outcome Measures
NameTimeMethod

Trial Locations

Locations (111)

Sierra Pacific Arthritis and Rheumatology Center

🇺🇸

Fresno, California, United States

Stanford Medicine

🇺🇸

Stanford, California, United States

Allergy & Asthma Clinical Research- Dedicated Research Facility

🇺🇸

Walnut Creek, California, United States

GI PROS Research - Dedicated Research Facility

🇺🇸

Naples, Florida, United States

Integral Rheumatology & Immunology Specialists

🇺🇸

Plantation, Florida, United States

Emory Univeristy

🇺🇸

Atlanta, Georgia, United States

Augusta University Medical Center

🇺🇸

Augusta, Georgia, United States

Rush University Medical Center

🇺🇸

Chicago, Illinois, United States

Massachusetts General Hospital

🇺🇸

Boston, Massachusetts, United States

Montefiore Medical Center

🇺🇸

Bronx, New York, United States

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Sierra Pacific Arthritis and Rheumatology Center
🇺🇸Fresno, California, United States

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