A Study of Dual-SIgnaling Protein 107 (DSP107) for Patients With Hematological Malignancies

An Open-label Phase Ib Study of DSP107 for Acute Myeloid Leukemia (AML) and Myelodysplastic Syndrome (MDS)

This study will be divided into two parts, Parts A and B and will enroll patients with relapsed/refractory AML or MDS/chronic myelomonocytic leukemia (CMML) patients who have failed up to 2 prior therapeutic regimens.

Part A is a dose escalation study to explore the safety, efficacy, pharmacokinetic (PK) and pharmacodynamic (PD) profile of DSP107 when administered in combination with azacitidine (AZA).

Part B is a dose escalation study to explore the safety, efficacy, PK and PD profile of DSP107 when administered in combination with AZA and venetoclax (VEN).

Study Overview

• Status: Terminated
• Conditions: Acute Myeloid Leukemia; Myelodysplastic Syndromes; Chronic Myelomonocytic Leukemia
• Intervention / Treatment: Biological: DSP107; Drug: Azacitidine; Drug: Venetoclax

Detailed Description

Part A is a dose escalation study in up to 4 cohorts of patients designed to test the safety and efficacy of DSP107 administered alone and in combination with AZA. The DSP107 starting dose level in Part A will be 0.3 mg/kg based on aggregate safety, PK and PD data from study DSP107_001, an ongoing study exploring the safety of escalating DSP107 doses in patients with advanced solid tumors. There will be a single DLT evaluation period, lasting 28 days, to determine the safety of DSP107 in combination with AZA. The safety, efficacy and PK data will be used to establish a recommended Phase II dose for potential future expansion cohorts and a starting dose for Part B.

Part B is a dose escalation study in 2 cohorts of patients that will test the safety and efficacy of DSP107 in combination with AZA and VEN. The starting dose for Part B will be at least one dose level lower than the DSP107 dose selected in Part A as being safe and effective in combination with AZA. Once a safe, effective dose has been established in Part B, a recommended phase 2 dose for patients with newly diagnosed AML will be agreed with the FDA at an End-of-Phase 1 meeting.

• Study Type: Interventional
• Enrollment (Actual): 25
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • California
    • Duarte, California, United States, 91010
      • City of Hope
  • Texas
    • Houston, Texas, United States, 77030
      • The University of Texas MD Anderson Cancer Center, Department of Leukemia

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2
• White Blood Cell count < 20 x 10^9/L.
• Adequate organ function
• Relapsed/refractory AML or MDS/CMML patients who have failed up to 2 prior therapeutic regimens.

Exclusion Criteria:

• Acute Promyelocytic leukemia
• Symptomatic central nervous system (CNS) leukemia or patients with poorly controlled CNS leukemia
• Life-threatening (grade 4) immune-mediated adverse event related to prior immunotherapy
• Immune-mediated adverse reaction that required discontinuation of prior immunotherapy
• Past or current history of autoimmune disease or immune deficiency
• History of severe interstitial lung disease or severe pneumonitis or active pneumonitis
• Clinically significant and poorly compensated liver disease
• Prior organ allografts (such as renal transplant) requiring active immunosuppression
• Active graft versus host disease
• Treatment with systemic immunostimulatory within 4 weeks prior to initiation of study treatment
• Treatment with any CD47/SIRPα targeting agent or immune agonists
• Known allergy or hypersensitivity to any of the test compounds, materials or contraindication to test product
• Received live, attenuated vaccine within 4 weeks prior to first dose of study treatment
• Active Hepatitis B or C infection
• History or evidence of any other clinically unstable/uncontrolled disorder, condition, or disease
• Pregnant or breast feeding or planning to become pregnant while enrolled in the study

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: DSP107 in combination with azacitidine or azacitidine plus venetoclax.; DSP107 will be administered by intravenous infusion once weekly during each 28-day cycle to all patients in this study. Azacitidine (75 mg/m2/day) will be administered subcutaneously or intravenously for the first 7 days of every cycle. Patients enrolled in Part B only will also receive venetoclax. During Cycle 1, venetoclax will be dose escalated daily to the goal dose of 400 mg daily. Patients will receive 100 mg on Day 1, 200 mg on Day 2 and 400 mg on Day 3 and onwards.

Biological: DSP107; DSP107 (SIRPα - 4-1BBL) is a bi-functional, trimeric, fusion protein.; Drug: Azacitidine; Azacitidine is an analog of the pyrimidine nucleoside cytidine.; Other Names: Vidaza; Drug: Venetoclax; Venetoclax is a B-cell lymphoma (BCL)-2 inhibitor; Other Names: Venclexta, Venclyxto

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Adverse Events (AEs)	An AE is any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product and which does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product, whether or not related to the medicinal (investigational) product.	Duration of the study, estimated to be 12 months
Dose Limiting Toxicities (DLT)	A DLT is defined as a clinically significant AE or laboratory abnormality that is related to DSP107 or the combination of DSP107 and AZA, but is unrelated to disease progression, intercurrent illness or concomitant medications	At the end of Treatment Cycle 2 (within 2 months of treatment initiation)
Response Rate (RR) including Complete Remission (CR) and Complete Remission with Incomplete Blood Count Recovery (CRi)	Response rates will be determined by assessing peripheral blood and bone marrow samples.	Within 6 months of treatment initiation

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Overall Response Rate (ORR)	Peripheral and bone marrow samples will be assessed to determine ORR. The ORR will measure the proportion of patients who achieve CR, CRi, complete remission with incomplete hematological recovery (CRh), complete remission with incomplete platelet recovery (CRp) or partial response (PR) within 6 months of treatment initiation, with or without cytogenetic response, hematological improvements and a morphologic leukemia-free state.	Within 6 months of treatment initiation
Morphologic Leukemia-Free (MLF) Rate	Peripheral and bone marrow samples will be assessed to determine the proportion of patients who are morphologically leukemia-free within 6 months of treatment initiation.	Within 6 months of treatment initiation
Minimal Residual Disease (MRD) Status	Peripheral and bone marrow samples will be assessed to determine minimal residual disease (MRD) status at response and/or the best MRD response during study participation.	Duration of the study, estimated to be 12 months
4-week Mortality Rate	The proportion of patients who die within 4 weeks of treatment initiation.	Within 4 weeks of treatment initiation
DSP107 Serum Concentration	Serum samples will be collected to determine circulating levels of DSP107.	Duration of the study, estimated to be 12 months
DSP107 anti-drug antibody (ADA) formation	Serum samples will be collected throughout the study for assessment of ADA formation using validated assay.	Duration of the study, estimated to be 12 months
Change in Phenotypic and Activation Profiles of Peripheral Blood Mononuclear Cells	Whole blood samples will be collected throughout the study for immunophenotyping by flow cytometry and/or mass cytometry.	Duration of the study, estimated to be 12 months

Collaborators and Investigators

• Sponsor: Kahr Medical

Study record dates

Study Major Dates

• Study Start (Actual): January 13, 2022
• Primary Completion (Actual): April 23, 2025
• Study Completion (Actual): October 24, 2025

Study Registration Dates

• First Submitted: June 6, 2021
• First Submitted That Met QC Criteria: June 17, 2021
• First Posted (Actual): June 23, 2021

Study Record Updates

• Last Update Posted (Estimated): November 7, 2025
• Last Update Submitted That Met QC Criteria: November 6, 2025
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Neoplasms; Chronic Disease; Disease Attributes; Neoplasms by Histologic Type; Hematologic Diseases; Leukemia, Myeloid; Myelodysplastic-Myeloproliferative Diseases; Bone Marrow Diseases; Leukemia; Pathological Conditions, Signs and Symptoms; Hemic and Lymphatic Diseases; Leukemia, Myeloid, Acute; Leukemia, Myelomonocytic, Chronic; Myelodysplastic Syndromes; Organic Chemicals; Heterocyclic Compounds, 1-Ring; Heterocyclic Compounds; Nucleic Acids, Nucleotides, and Nucleosides; Cytidine; Pyrimidine Nucleosides; Pyrimidines; Aza Compounds; Nucleosides; Ribonucleosides; Azacitidine; venetoclax
• Other Study ID Numbers: DSP107_002

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No