Efficacy and Safety of Romiplostim N01 Combined With Rituximab in Patients With Oral TPO-RA-Refractory Primary Immune Thrombocytopenia

NCT ID: NCT07206823

Last Updated: 2025-12-04

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 30 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-09-01
• Study Completion Date: 2027-07-31

Brief Summary

The primary objective of this trial is to assess the efficacy and safety of combining Romiplostim N01 with Rituximab for the treatment of adult patients with primary immune thrombocytopenia (ITP) whose disease is refractory to oral TPO-RAs.

All participants in this study will receive the same combination treatment:

Rituximab: Given once a week through an intravenous infusion for 4 weeks. Romiplostim N01: Given as a weekly injection，the dose may be adjusted each week based on the patient's platelet count.

Participants will be asked to:

Visit the clinic regularly for check-ups, blood tests (to monitor platelet counts), and safety assessments.

Report their bleeding symptoms for evaluation. This is an open-label, single-arm trial, meaning that all participants will receive the investigational treatment, and both the research team and participants will be aware of the treatment assigned. The study aims to enroll approximately 30 adult patients aged 14 years or older who have been diagnosed with ITP and have not responded adequately to prior oral TPO-RAs (eltrombopag/hetrombopag).

Conditions

Primacy Immune Thrombocytopenia

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Romiplostim N01 + Rituximab Combination Therapy

Group Type: EXPERIMENTAL

Romiplostim N01

Intervention Type: DRUG

Romiplostim N01 will be administered via subcutaneous injection once weekly based on the platele count. The starting dose is set at 3 μg/kg. Weekly dose adjustments will be guided by platelet counts measured immediately prior to administration, as follows:

For a platelet count below 50 × 10⁹/L, the dose will be increased by 1 μg/kg.

For a platelet count between 50 and 200 × 10⁹/L, the current dose will be maintained as the minimum therapeutic dose for bleeding risk reduction.

For a platelet count between 200 and 400 × 10⁹/L, the dose will be decreased by 1 μg/kg.

For a platelet count exceeding 400 × 10⁹/L, the administration will be withheld. It is stipulated that dosing will resume at a reduction of 1 μg/kg from the previous dose once the platelet count returns to 200 × 10⁹/L or below.

Under no circumstances shall the dose exceed the maximum allowable limit of 10 μg/kg per week.

Rituximab

Intervention Type: DRUG

Rituximab will be administered in accordance with the Chinese guidelines for the diagnosis and management of adult primary immune thrombocytopenia (2020 edition). The dosage will be 375 mg/m² per infusion, administered via intravenous infusion once weekly for a total of four weeks.

Interventions

Romiplostim N01

Romiplostim N01 will be administered via subcutaneous injection once weekly based on the platele count. The starting dose is set at 3 μg/kg. Weekly dose adjustments will be guided by platelet counts measured immediately prior to administration, as follows:

For a platelet count below 50 × 10⁹/L, the dose will be increased by 1 μg/kg.

For a platelet count between 50 and 200 × 10⁹/L, the current dose will be maintained as the minimum therapeutic dose for bleeding risk reduction.

For a platelet count between 200 and 400 × 10⁹/L, the dose will be decreased by 1 μg/kg.

For a platelet count exceeding 400 × 10⁹/L, the administration will be withheld. It is stipulated that dosing will resume at a reduction of 1 μg/kg from the previous dose once the platelet count returns to 200 × 10⁹/L or below.

Under no circumstances shall the dose exceed the maximum allowable limit of 10 μg/kg per week.

Intervention Type: DRUG

Rituximab

Rituximab will be administered in accordance with the Chinese guidelines for the diagnosis and management of adult primary immune thrombocytopenia (2020 edition). The dosage will be 375 mg/m² per infusion, administered via intravenous infusion once weekly for a total of four weeks.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

Confirmed diagnosis of primary immune thrombocytopenia (ITP).

Age ≥14 years.

Prior exposure to at least one ITP-directed therapy (e.g., corticosteroids, intravenous immunoglobulin, recombinant human thrombopoietin, TPO-RAs, immunosuppressants, or splenectomy), including a minimum 4-week course of an oral TPO-RA (hetrombopag or eltrombopag) that was discontinued due to insufficient response.

Platelet count < 30 × 10⁹/L at screening, OR platelet count < 50 × 10⁹/L with concurrent clinically significant bleeding.

Stable glucocorticoid dose (e.g., prednisone or methylprednisolone, not exceeding 4 tablets daily) for at least 2 weeks, and stable dosing of any other immunosuppressants for at least 4 weeks prior to enrollment.

No receipt of intravenous immunoglobulin within 2 weeks before the first dose of study treatment.

No platelet transfusion within 1 week before the first dose of study treatment.

Exclusion Criteria

Secondary ITP due to underlying conditions such as other autoimmune disorders, viral infections, or drug exposure.

Presence of active malignancy, pregnancy, significant cardiovascular or cerebrovascular disease, or history of arterial/venous thrombosis.

• Minimum Eligible Age: 14 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

The First Affiliated Hospital of Soochow University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

The First Affiliated Hospital of Soochow University

Suzhou, Jiangsu, China

Site Status: RECRUITING

Countries

China

Central Contacts

Hong Tian

Role: CONTACT

tianhong0718@163.com

+86 0512 67781521

Facility Contacts

Hong Tian

Role: primary

tianhong0718@163.com

+86 0512 67781521

Other Identifiers

2025767

Identifier Type: -

Identifier Source: org_study_id