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Plonmarlimab

Phase 3

Relapsed/Refractory Rheumatic and Immunologic Disease-associated Haemophagocytic Lymphohistiocytosis | Small molecule | Other |I-Mab Sponsored ADR|Last Updated: Jul 20, 2026

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Trial Design
UNCONTROLLED
Total Trials1
Total Enrollment30
FDA Designations
No designations recorded
Clinical trial landscape

Plonmarlimab · 3 trials · 3 indications

Phase 3 1Phase 2 2
NCT07208058A Phase III Clinical Study to Evaluate the Efficacy, Safety, and Tolerability of Plonmarlimab in Subjects With Relapsed/Refractory Rheumatic and Immunologic Disease-associated Haemophagocytic Lymphohistiocytosis (Also Known as Macrophage Activation Syndrome [MAS])Relapsed/Refractory Rheumatic and Immunologic Disease-associated Haemophagocytic Lymphohistiocytosis
RECRUITING30 Analytics
PHASE3RECRUITING
A Phase III Clinical Study to Evaluate the Efficacy, Safety, and Tolerability of Plonmarlimab in Subjects With Relapsed/Refractory Rheumatic and Immunologic Disease-associated Haemophagocytic Lymphohistiocytosis (Also Known as Macrophage Activation Syndrome [MAS])
Relapsed/Refractory Rheumatic and Immunologic Disease-associated Haemophagocytic LymphohistiocytosisUnlock trial analytics
Study Endpoints
Primary Endpoints
Overall response rate (ORR)
at the end of Week 8
Visual Analogue Scale(VAS) score
72 hours after the initial dose.

The change from baseline in the subject's self-assessed Visual Analogue Scale (VAS) score for pain intensity in the most severely affected joint at baseline, assessed at 72 hours after the initial dose.

Overall Response Rate,ORR
At the end of Week 8
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
PlonmarlimabEXPERIMENTAL -
Group1-Plonmarlimab 3mg/kgEXPERIMENTALPlonmarlimab 3mg/kg, Single dose, Intravenous infusion
Group2-Plonmarlimab 6mg/kgEXPERIMENTALPlonmarlimab 6mg/kg, Single dose, Intravenous infusion
Group3-Compound betamethasoneACTIVE_COMPARATORCompound betamethasone 7 mg, single dose, intramuscular injection
Interventions
NameTypeDescription
PlonmarlimabDRUGSubjects will receive Plonmarlimab 10 mg/kg by intravenous injection once weekly from Week 1 to Week 3, and Plonmarlimab 6 mg/kg by intravenous injection once weekly from Week 4 to Week 8 (10 mg/kg QW×3 + 6 mg/kg QW×5).
Compound betamethasoneDRUGsingle dose, intramuscular injection
Plonmarlimab placeboDRUGsingle dose, intravenous infusion
Compound betamethasone placeboDRUGsingle dose, intramuscular injection
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Eligibility Criteria
Age Range16 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites18

Inclusion Criteria: * Age: 16 to 80 years (inclusive), of any gender. * The subject is willing to participate in this study and voluntarily signs the informed consent form. For minor subjects aged 16 years (inclusive) to less than 18 years, written informed consent must be signed by both the subjec...

Countries:China
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Recent Changes (Last 90 Days)
LOWJul 20, 2026NCT07208058lastUpdatePostDate: changed
LOWJul 20, 2026NCT07208058lastUpdatePostDate: changed
LOWJun 24, 2026NCT07208058lastUpdatePostDate: changed
LOWJun 24, 2026NCT07208058lastUpdatePostDate: changed
LOWMay 26, 2026NCT07453004primaryCompletionDate: changed
LOWMay 26, 2026NCT07208058primaryCompletionDate: changed
LOWMay 24, 2026NCT07453004studyFirstPostDate: changed
LOWMay 24, 2026NCT07208058studyFirstPostDate: changed