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Obexelimab

Phase 3

Warm Autoimmune Hemolytic Anemia | Small molecule | Hematology |Zenas BioPharma, Inc.|Last Updated: Feb 4, 2026

Success Probability
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Market & Valuation
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment134
FDA Designations
No designations recorded
Clinical trial landscape

Obexelimab · 4 trials · 4 indications

Phase 3 2Phase 2 2
NCT05786573A Study of Obexelimab in Patients With Warm Autoimmune Hemolytic Anemia (SApHiAre)Warm Autoimmune Hemolytic Anemia
ACTIVE NOT_RECRUITING134 Analytics
NCT05662241A Phase 3 Study of Obexelimab in Patients With IgG4-Related DiseaseIgG4 Related Disease
ACTIVE NOT_RECRUITING194 Analytics
PHASE3ACTIVE NOT_RECRUITING
A Study of Obexelimab in Patients With Warm Autoimmune Hemolytic Anemia (SApHiAre)
Warm Autoimmune Hemolytic AnemiaUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study of Obexelimab in Patients With IgG4-Related Disease
IgG4 Related DiseaseUnlock trial analytics
Study Endpoints
Primary Endpoints
Safety and Dose Confirmation Run-in Period (SRP)
24 weeks

Proportion of participants with hemoglobin (Hgb) ≥ 10 g/dL and ≥ 2 g/dL increase from Baseline with no use of blood transfusion or glucocorticoid (GC) rescue therapy.

Randomized Control Period (RCP)
24 weeks

Proportion of participants who achieve a durable Hgb response (defined as Hgb ≥ 10 g/dL and ≥ 2 g/dL increase from Baseline on at least 3 of 4 consecutive available visits), at the earliest on or after Week 12, with no use of blood transfusion or GC rescue therapy prior to attaining durable response through Week 24.

Primary outcome measure
Randomization 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.

Cumulative number of new GdE T1 hyperintense lesions
Week 8 and Week 12

Cumulative number of new GdE T1 hyperintense lesions as measured by brain MRI

Secondary Endpoints
Secondary Outcome Measures
24 weeks
Number of T2 Lesions
Week 8 and Week 12
Number of GdE T1 lesions
Week 4, Week 8, and Week 12
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Safety and Dose Confirmation Run-in Period (SRP): ObexelimabEXPERIMENTALObexelimab will be administered as an SC injection for 24 weeks.
Randomized Control Period (RCP): ObexelimabEXPERIMENTALObexelimab will be administered as an SC injection for 24 weeks.
Randomized Control Period (RCP): PlaceboPLACEBO_COMPARATORPlacebo will be administered as an SC injection for 24 weeks
ZB012EXPERIMENTALObexelimab administered as an SC injection.
PlaceboPLACEBO_COMPARATORPlacebo administered as an SC injection.
ObexelimabEXPERIMENTALObexelimab will be administered as a subcutaneous injection for 24 weeks.
Interventions
NameTypeDescription
ObexelimabDRUGObexelimab is a monoclonal antibody that simultaneously binds CD19 and FcγRIIb, resulting in down regulation of B cell activity.
PlaceboOTHERPlacebo
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Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites7

Inclusion Criteria: 1. Males and females, ≥ 18 years of age 2. Clinically diagnosed with wAIHA for at least 3 months and currently receiving treatment for wAIHA or have previously received treatment for wAIHA. 3. Diagnosis of primary or secondary wAIHA documented by a positive direct antiglobulin t...

Countries:ItalyPolandSpainTaiwanUnited KingdomUnited StatesArgentinaCanadaChinaFranceGermanyJapanMexicoSouth KoreaTurkey (Türkiye)BelgiumBulgariaDenmarkGreecePortugalPuerto RicoRomaniaSouth AfricaAustriaCroatiaCzechia
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Competitive Landscape -Autoimmune Hemolytic Anemia 9 trials (matched to "Warm Autoimmune Hemolytic Anemia")
Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06559163primaryCompletionDate: changed
LOWMay 26, 2026NCT05662241primaryCompletionDate: changed
LOWMay 26, 2026NCT06564311primaryCompletionDate: changed
LOWMay 26, 2026NCT05786573primaryCompletionDate: changed
LOWMay 24, 2026NCT06559163studyFirstPostDate: changed
LOWMay 24, 2026NCT06564311studyFirstPostDate: changed
LOWMay 24, 2026NCT05662241studyFirstPostDate: changed
LOWMay 24, 2026NCT05786573studyFirstPostDate: changed