JSP191 Antibody Conditioning Regimen in MDS/AML Subjects Undergoing Allogenic Hematopoietic Stem Cell Transplantation

Jasper Therapeutics

Status and phase: Unknown; Phase 1

Conditions: ACUTE MYELOID LEUKEMIA; AML; MYELODYSPLASTIC SYNDROME; MDS

Treatments: Biological: Humanized anti-CD117 Monoclonal Antibody (JSP191)

Study type: Interventional

Funder types: Industry

Identifiers

NCT04429191

JSP-CP-003

Details and patient eligibility

About

This is a Phase 1a/b study to evaluate the safety and tolerability of an antibody conditioning regimen known as JSP191, in combination with low dose radiation and fludarabine, in subjects with Myelodysplastic Syndrome (MDS) or Acute Myeloid Leukemia (AML) undergoing allogenic blood stem cell transplantation.

Full description

This is a Phase 1a/b study to evaluate the safety and tolerability of an antibody conditioning regimen known as JSP191, in combination with low dose radiation and fludarabine in subjects with Myelodysplastic Syndrome (MDS) or Acute Myeloid Leukemia (AML) undergoing allogenic blood stem cell transplantation.

Blood Stem Cell transplantation offers the only potentially curative therapy for many forms of Acute Myeloid Leukemia (AML) and for Myelodysplastic Syndrome (MDS). While standard of care conditioning regimens given prior to blood Stem Cell transplantation, such as standard TBI/Flu conditioning are well tolerated, they are associated with increased rates of relapse due to persistence of disease causing Hematopoietic Stem Cells and insufficient graft versus leukemia effect.

The biological conditioning regimen JSP191 is an antibody that binds to CD117. CD117 is the receptor for Stem Cell Factor on blood forming cells. CD117 binding to Stem Cell Factor is critical for survival and maintenance of blood forming stem cells.

The binding of JSP191 to CD117 blocks CD117 from binding to Stem Cell Factor on blood forming stem cells. In the absence of CD117/Stem Cell Factor binding, hematopoietic stem cells that are currently occupying the bone marrow niches in MDS/AML patients are depleted.

This study will investigate the safety and tolerability of adding JSP191 (an anti-CD117 monoclonal antibody therapy) to standard TBI/Flu conditioning regimen in adults with AML and MDS undergoing hematopoietic stem cell transplant.

Enrollment: 40 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion and exclusion criteria

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 unrelated donors

• Adequate end organ function as defined in study protocol

Key Exclusion Criteria:

• Patients with any acute or uncontrolled infections
• Patients receiving any other investigational agents
• Patients with active non-hematologic malignancy
• Prior allogeneic hematologic cell transplantation

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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40 participants in 1 patient group

Blood Stem Cell Transplant w/ anti-CD117 conditioning

Experimental group

Description:

The 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.

Treatment:

Biological: Humanized anti-CD117 Monoclonal Antibody (JSP191)