Open-Label, Phase II Trial of Isatuximab for Patients With Refractory Immune Cytopenias After Allogeneic Hematopoietic Cell Transplantation

NCT05873205 | Active Not Recruiting Phase 2 FDA Drug

• 1 other identifier: 23-119
• Study Type: interventional
• Target: 12
• Locations: 1 country
• Sites: 7

Brief Summary

The purpose of this study is to find out whether isatuximab is an effective treatment for people who developed immune cytopenias/ICs after allogeneic hematopoietic cell transplant/allo-HCT.

Conditions

Blood Cancer; Refractory Immune Cytopenias

Keywords

Refractory Immune Cytopenias; Blood Cancer; Isatuximab; Allogeneic Hematopoietic Cell Transplantation; 23-119; Memorial Sloan Kettering

Outcome Measures

Primary Outcomes (1)

• Overall response rate

  To estimate the overall response rate (ORR; complete response \[CR\] + response)

  Up to 4 years

Study Arms (1)

Participants with Refractory Immune Cytopenias

EXPERIMENTAL

Participants will be adults who develop Immune Cytopenias/ICs after Allogeneic Hematopoietic Cell Transplantation/allo-HCT and who did not respond to initial immunosuppressive therapy.

Biological: Isatuximab

Interventions

Isatuximab BIOLOGICAL

All participants enrolled on the study will receive isatuximab intravenously as a single agent

Participants with Refractory Immune Cytopenias

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Age ≥ 18 years (There are no dosing/AE data for isatuximab in children).
• Disease for which patient underwent an allo-HCT is in documented remission.
• Patients must have previously had documented primary neutrophil and platelet engraftment, defined as:
• Neutrophil engraftment: the first of 3 successive days with an absolute neutrophil count of ≥500/μL after post-transplantation nadir.
• Platelet engraftment: the first of 3 consecutive days with a platelet count of 20,000/μL or higher in the absence of platelet transfusion for 7 consecutive days.
• Patients must be at least 45 days post allogeneic HCT to enroll.
• Patients must be diagnosed with IC(s) based on the following criteria:
• o For AIHA: Positive (abnormal) DAT test and decreasing hemoglobin of ≥2 g/dL from a stable baseline (i.e., from the patients typical hemoglobin value prior to AIHA) and at least grade 2 (i.e., hemoglobin \<10 g/dL) due to evidence of hemolytic anemia with ≥2 of the following tests: increased reticulocyte count (\>ULN), increased lactate dehydrogenase (LDH) (\>ULN), decreased haptoglobin (\<LLN), increased unconjugated bilirubin (\>ULN).
• For ITP: decreasing thrombocytopenia from baseline (i.e., from the patients typical platelet count prior to ITP) and platelet count ≤30 K/µL or requiring platelet transfusions in the absence of other causes of thrombocytopenia (including drug-induced thrombocytopenia), and with normal or increased bone marrow megakaryocytes.
• Patients with concomitant ICs can be enrolled on the study.
• Patient must have responded incompletely to their previous treatment, defined as:
• Corticosteroid refractoriness: defined as a clear progression or minimal responsiveness of IC(s) after ≥7 days of treatment with prednisone equivalent of ≥1 mg/kg/day.
• Corticosteroid dependence: defined as dependence on prednisone equivalent of ≥0.5 mg/kg/day to maintain hemoglobin level ≥2 g/dL nadir level (for AIHA and/or PRCA), and/or platelet count ≥30 x 109/L or ≥2-fold increase from nadir level (for ITP).
• Refractory IC(s) after ≥2 treatment lines including corticosteroids (≥0.5 mg/kg/day prednisone equivalent), IVIG (400 mg/kg/day for 2 to 5 days), and/or rituximab, etc.
• For rituximab treated patients, refractoriness will be defined as no or minimal response within 2 weeks of completing ≥4 doses of rituximab.

You may not qualify if:

• Presence of relapse/progression of malignant disease for which the patient underwent allo-HCT
• Patients with anemia and/or thrombocytopenia related to transplant-associated thrombotic microangiopathy.
• Patients with active GVHD requiring therapy may be eligible if the GVHD is responsive to treatment (\< grade 4 in severity), and after agreement between the sponsor and principal investigator.
• Organ insufficiency based on above criteria.
• Pregnancy or unwillingness to agree to birth control as noted above.
• Known to be HIV+ or to have active hepatitis A, B, or C infection (i.e., with viremia).
• Of note:
• Patients can be eligible if anti-HBc seropositive (with or without positive anti-HBs), but HBsAg and HBV DNA are negative.
• Patients with antiviral therapy for HCV started before initiation of treatment and positive Hep C antibodies are eligible. The antiviral therapy for Hep C should continue throughout the treatment period until seroconversion. Patients with positive anti-Hep C and undetectable Hep C RNA without antitviral therapy for Hep C are eligible.
• Any clinically significant, uncontrolled medical condition(s), including infection(s) that, in the Investigator's opinion, would expose the patient to excessive risk or may interfere with compliance or interpretation of the study results.
• Hypersensitivity or history of intolerance to steroids, mannitol, pregelatinized starch, sodium stearyl fumarate, histidine (as base and hydrochloride salt), arginine hydrochloride, poloxamer 188, sucrose, prior anti-CD38 moAb such as daratumumab, or any of the other components of study intervention that are not amenable to premedication with steroids and H2 blockers or would prohibit further treatment with these agents.
• Received any investigational drug within 14 days or 5 half-lives of the investigational drug prior to initiation of study intervention, whichever is longer. In case of very aggressive disease (e.g., acute leukemia) delay could be shortened after agreement between sponsor and principal investigator, in absence of residual toxicities from previous therapy.
• Patients on post-HCT maintenance therapy to reduce the risk of relapse (for patients with hematologic malignancies) or GVHD (e.g., FLT3 inhibitors, etc.) may be eligible after agreement between the sponsor and principal investigator.
• Contraindication to any concomitant medication, including pre-medications or hydration given prior to therapy
• Participants who are unable to consent to the study or comply with the study procedures.

Sponsors & Collaborators

• Memorial Sloan Kettering Cancer Center: lead
• Sanofi: collaborator

Study Sites (7)

Memorial Sloan Kettering Basking Ridge (Limited Protocol Activities)

Basking Ridge, New Jersey, 07920, United States

Location

Memorial Sloan Kettering Monmouth (Limited Protocol Activities)

Middletown, New Jersey, 07748, United States

Location

Memorial Sloan Kettering Bergen (Limited protocol activities)

Montvale, New Jersey, 07645, United States

Location

Memorial Sloan Kettering Suffolk-Commack (All Protocol Activities )

Commack, New York, 11725, United States

Location

Memorial Sloan Kettering Westchester (Limited Protocol Activities)

Harrison, New York, 10604, United States

Location

Memorial Sloan Kettering Cancer Center (All Protocol Activities)

New York, New York, 10065, United States

Location

Memorial Sloan Kettering Nassau (All protocol activities)

Rockville Centre, New York, 11553, United States

Location

Related Links

• Memorial Sloan Kettering Cancer Center

MeSH Terms

Conditions

Hematologic Neoplasms

Interventions

isatuximab

Condition Hierarchy (Ancestors)

Neoplasms by Site; Neoplasms; Hematologic Diseases; Hemic and Lymphatic Diseases

Study Officials

• Michael Scorder, MD

  Memorial Sloan Kettering Cancer Center

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: May 15, 2023
• First Posted: May 24, 2023
• Study Start: July 21, 2023
• Primary Completion (Estimated): June 29, 2027
• Study Completion (Estimated): June 29, 2027
• Last Updated: April 2, 2026

Record last verified: 2026-04

Data Sharing

• IPD Sharing: Will share

Locations

US (7)