A Clinical Trial to Assess Safety and Efficacy of Daratumumab in the Treatment of Primary Immune Thrombocytopenia

A Investigator-initiated Clinical Trial to Assess Safety and Efficacy of Daratumumab in the Treatment of Relapsed/Refractory Primary Immune Thrombocytopenia

A single-center, open-label, off-label use investigator-initiated clinical study to explore the clinical activity and safety of daratumumab in adult ITP patients who have not responded adequately or relapsed after first-line treatment and at least one second-line therapy including rituximab and/or TPO-RA.

Study Overview

• Status: Active, not recruiting
• Conditions: Immune Thrombocytopenia
• Intervention / Treatment: Drug: Daratumumab Injection

Detailed Description

Primary immune thrombocytopenia is an autoimmune disease associated with a reduced peripheral blood platelet count. The first-line treatment is corticosteroids. Splenectomy, rituximab, and thrombopoietin receptor agonists (TPO RAs, such as Etrapopar and Romistine) are commonly used as second-line therapy. However, many of the treatments used achieve few lasting remissions. About 20% - 30% of patients have inadequate or no response to first-line and second-line treatment, and would develop into recurrent/refractory (r/r) ITP.

A branch of pathogenesis for ITP has been revealed that plasma cells secrete pathogenic antibodies directed against platelet and red blood cell antigens. Antiplatelet specific plasma cells have been detected in the spleen of patients with rituximab refractory ITP. In those refractory cases, persistent autoreactive long-lived plasma cells in the bone marrow could explain treatment failure.

Daratumumab, an anti-CD38 monoclonal antibody developed to target tumoral plasma cells in multiple myeloma, was recently found to be effective in antibody-mediated diseases, such as autoimmune cytopenia following hematopoietic stem cell transplantation, systemic lupus and also ITP.

This study will evaluate the safety and biologic activity of Daratumumab in r/r primary ITP who fail to respond to at least one previous second-line therapy. The study will enroll approximately 20 participants. This trial will be conducted in China. All participants will be followed for at least 16 weeks after the 8 weeks of treatment.

• Study Type: Interventional
• Enrollment (Estimated): 60
• Phase: Phase 2

Contacts and Locations

Study Locations

• China
  • Tianjin
    • Tianjin, Tianjin, China, 300020
      • Chinese Academy of Medical Science and Blood Disease Hospital

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Male or female aged ≥18 years.
• Diagnosed with ITP that has persisted for ≥3 months and with a platelet count of <30 X 109/L measured within 2 days prior to inclusion.
• Failure to achieve response or relapse after corticosteroid therapy, and at least one second-line therapy including rituximab and/or TPO-RA.
• If receiving emergency care for ITP, treatment should be stopped >2 weeks before first dose.
• A positive result to the ELISA test to detect antibody against GPIIb/IIIa or GPIIb/IIIa and GPIb/IX within 1 week prior to inclusion.
• With normal hepatic and renal functions.
• ECOG Performance Status ≤ 2.

February 16, 2023 After approval by the Ethics Committee on , subjects no longer require platelet glycoprotein autoantibodies positivity upon enrollment.

Exclusion Criteria:

• Received any treatment of anti-CD38 antibody drug.
• Has been diagnosed with malignancy and/or liver failure, heart failure and renal failure.
• Known previous infection or seropositivity for HIV, Hepatitis B, Hepatitis C, Cytomegalovirus, EB virus, Syphilis.
• Any clinically overt hemorrhage.
• Has been diagnosed with cardiac disease, arrhythmia and/or severe or uncontrollable hypertension
• Known pulmonary embolism, thrombosis and/or atherosclerosis.
• Has been received allogeneic stem cell transplantation or organ transplantation.
• Patients with history of current or past psychiatric disease that might interfere with the ability to comply with the study protocol or give informed consent.
• Pregnancy or lactation.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Intervention; Daratumumab once a week x 8 doses	Drug: Daratumumab Injection; intravenous daratumumab administration; Other Names: Darzalex

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Evaluate of response after daratumumab treatment	The proportion of patients with 2 consecutive platelet counts of ≥ 50×109/L within 8 weeks	8 weeks
Incidence of Treatment-Emergent Adverse Events [Safety and Tolerability] of daratumumab	Incidence, severity, and relationship of treatment emergent adverse events after daratumumab treatment	24 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The proportion of patients with ≥2 consecutive platelet counts (separated by ≥7 days) of ≥30 × 109/L and a ≥2-fold increase from the baseline count within 8 weeks	The proportion of patients with ≥2 consecutive platelet counts (separated by ≥7 days) of ≥30 × 109/L and a ≥2-fold increase from the baseline count within 8 weeks.	8 weeks
Time to first platelet count of ≥50 × 109/L without salvage therapy.	Time to first platelet count of ≥50 × 109/L without salvage therapy.	24 weeks
Overall response rate at week 8 and week 24	Complete response (CR) : 2 or more consecutive monitored platelet counts ≥100 × 109/L without bleeding symptoms,with an interval of at least 7 days; Partial response (PR) : 2 or more consecutive monitored platelet counts ≥30 × 109/L, at least a double baseline count (separated by ≥7 days), and no bleeding symptoms. Overall response (OR) : CR or PR.	24 weeks
Complete response rate at week 8 and week 24	Complete response (CR) : 2 or more consecutive monitored platelet counts ≥100 × 109/L without bleeding symptoms,with an interval of at least 7 days.	24 weeks
Cumulative response duration of platelet count of ≥30 × 109/L and a platelet count doubling from the baseline within 24 weeks	Cumulative response duration of platelet count of ≥30 × 109/L and a platelet count doubling from the baseline within 24 weeks.	24 weeks
Durable sustained platelet count response rate	Durable sustained platelet count response rate is defined as the proportion of subjects with platelet counts of ≥30 × 109/L for at least six of the eight visits between weeks 17 and 24 of the study.	24 weeks
WHO bleeding score at baseline and at week 8 and 24 after treatment	WHO bleeding score at baseline and at week 8 and 24 after treatment. The WHO Bleeding Scale is a measure of bleeding severity with the following grades: grade 0 = no bleeding, grade 1= petechiae, grade 2= mild blood loss, grade 3 = gross blood loss, and grade 4 = debilitating blood loss.	24 weeks
The proportion of subjects with concomitant medication reduction or discontinuation	The proportion of subjects with concomitant medication reduction or discontinuation within 24 weeks.	24 weeks
The proportion of subjects receiving rescue medications	The proportion of subjects receiving rescue medications within 24 weeks.	24 weeks
Changes in immunoglobulin levels	Changes in immunoglobulin levels before and after treatment	24 weeks

Collaborators and Investigators

• Sponsor: Institute of Hematology & Blood Diseases Hospital, China
• Investigators: Principal Investigator: Lei Zhang, M.D., Institute of Hematology & Blood Diseases Hospital, China

Study record dates

Study Major Dates

• Study Start (Actual): December 10, 2022
• Primary Completion (Actual): January 31, 2025
• Study Completion (Estimated): December 31, 2025

Study Registration Dates

• First Submitted: September 28, 2022
• First Submitted That Met QC Criteria: September 28, 2022
• First Posted (Actual): October 3, 2022

Study Record Updates

• Last Update Posted (Actual): May 28, 2025
• Last Update Submitted That Met QC Criteria: May 22, 2025
• Last Verified: May 1, 2024

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Cytopenia; Pathologic Processes; Autoimmune Diseases; Immune System Diseases; Hemorrhage; Skin Manifestations; Hematologic Diseases; Blood Coagulation Disorders; Hemorrhagic Disorders; Blood Platelet Disorders; Thrombotic Microangiopathies; Purpura, Thrombocytopenic; Purpura; Thrombocytopenia; Purpura, Thrombocytopenic, Idiopathic; Antineoplastic Agents; Daratumumab
• Other Study ID Numbers: IIT2022039（1）; 2022-D-ITP (Other Identifier: CAMS&PUMC)

Drug and device information, study documents

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