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Humanized anti-CD117 Monoclonal Antibody

Phase 1

MYELODYSPLASTIC SYNDROME; MDS | Monoclonal antibody | Oncology |Jasper Therapeutics, Inc.|Last Updated: Sep 28, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Humanized anti-CD117 Monoclonal Antibody (JSP191)

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment32

FDA Designations

No designations recorded

Clinical trial landscape

Humanized anti-CD117 Monoclonal Antibody · 1 trial · 2 indications

Phase 1 1
NCT04429191JSP191 Antibody Conditioning Regimen in MDS/AML Subjects Undergoing Allogenic Hematopoietic Stem Cell TransplantationMYELODYSPLASTIC SYNDROME; MDS
COMPLETED32 Analytics
PHASE1COMPLETED
JSP191 Antibody Conditioning Regimen in MDS/AML Subjects Undergoing Allogenic Hematopoietic Stem Cell Transplantation
MYELODYSPLASTIC SYNDROME; MDSUnlock trial analytics

Study Endpoints

Primary Endpoints

The number of subjects experiencing adverse events and serious adverse events will be assessed.
Up to 1 year post Donor Cell Transplant (28 days dose limiting toxicity period)
The number of dose limiting toxicities will be assessed.
Up to 1 year post Donor Cell Transplant (28 days dose limiting toxicity period)
The type of dose limiting toxicities will be assessed.
Up to 1 year post Donor Cell Transplant (28 days dose limiting toxicity period)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Blood Stem Cell Transplant w/ anti-CD117 conditioningEXPERIMENTALThe phase 1a portion of the study plans to assess approximately 3 planned dose cohorts of JSP191: 0.3 mg/kg, 0.6 mg/kg, and 1.0 mg/kg to determine the maximum tolerated dose for expansion. Subjects will receive a single dose of intravenous JSP191 antibody followed by monitoring for antibody clearance. Once the antibody has cleared below a certain level, patients will receive stem cell transplant and be monitored for hematopoietic recovery. The phase 1b portion of the study will enroll additional subjects at the expansion dose in order to further explore the safety, feasibility, and PK of that dose.

Interventions

NameTypeDescription
Humanized anti-CD117 Monoclonal Antibody (JSP191)BIOLOGICALProcedure: single intravenous infusion of JSP191 antibody
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites6

Key Inclusion Criteria: * AML/MDS as defined by specific criteria, including but not limited to the following subtypes: 1. AML in CR 2. MDS \< 5% BM blasts 3. MDS 5 - 10% BM blasts 4. AML not in CR or MDS \> 10% BM blasts * Patients with human leukocyte antigen (HLA) matched related or unr...

Countries:United States
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