Efficacy and Safety Study of Maintenance Treatment With rhTPO in Thrombocytopenic Subjects With ITP

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the efficacy and safety of rhTPO in the maintenance treatment of ITP, to explore the appropriate dosing interval of the maintenance treatment of rhTPO .

Detailed Description
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The eligible subjects with ITP firstly will receive a pre-treatment of rhTPO 300 IU/Kg once daily up to 14 days. The subjects with two consecutive platelet counts above 50×10^9/L in the pre-treatment period will begin to receive maintenance treatment of rhTPO 300 IU/Kg for 12 weeks. In the period of maintenance treatment, starting dosing interval of rhTPO is every other day followed by the interval adjustments for keeping platelet counts between 30 ×10^9/L～100 ×10^9/L. Subsequently, subjects will stop treatment of rhTPO and be followed up for 4 weeks after maintenance treatment. Platelet count, bleeding and other symptoms will be evaluated before and after treatment. Platelet transfusion will be administered to subjects with active bleeding symptoms. Toxicity will be monitored continuously during the entire study. Safety will be assessed by adverse events and laboratory tests.

Official Title
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A Multicenter, Single-Arm, Open Label Study Evaluating the Efficacy and Safety of Maintenance Treatment With Recombinant Human Thrombopoietin in Thrombocytopenic Subjects With Immune Thrombocytopenia

Conditions
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Thrombocytopenia, Immune Thrombocytopenia, Idiopathic Thrombocytopenic Purpura

Intervention / Treatment
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* Drug: rhTPO


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Meeting the diagnostic criteria for immune thrombocytopenia (idiopathic thrombocytopenic purpura). Subject with resistance to or relapse after glucocorticoid in the treatment of ITP, not accepts splenectomy, or subject with ineffective or relapse after surgical splenectomy. Two consecutive platelet counts (not in the same day) < 30×10^9/L. Subject is willing and able to provide written informed consent. Exclusion Criteria: Pregnancy or breast feeding. Having a medical history of thrombosis. Significant abnormal cardio-pulmonary function. Abnormal liver and kidney function: a serum creatinine concentration≥ 176.8µmol/l (1.5mg/dl); a serum aminotransferase concentration: more than 2.0 times the upper limit of the normal range. a serum bilirubin concentration: more than 2.0 times the upper limit of the normal range. Synchronous tumor. Cannot adopt adequate contraceptive precautions during the course of the study. Any other treatment drugs for ITP are being taken (except the duration of reducing glucocorticoid dosage as ineffective treatment ). Any other situation that is not suitable for participating in the trial according to the judgment of the investigator .

Ages Eligible for Study
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Minimum Age: 14 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: rhTPO<br>Active investigational product | Drug: rhTPO<br>* Subcutaneously dosing of rhTPO is based on screening weight. Subjects will be given rhTPO 300 IU/Kg once daily up to 14 days in the pre-treatment period . When two consecutive platelet counts is above 50×10^9/L, the subjects will be begin to receive maintenance treatment of rhTPO 300 IU/Kg. In the period of maintenance treatment, starting dosing interval of rhTPO is every other day followed by the interval adjustments for keeping platelet counts between 30×10^9/L～100×10^9/L.<br>* Other names: Recombinant Human TPO;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The effective rate of maintenance treatment (the platelet count continued to be over 30 × 10^9/L) |  | up to 16 weeks per subject | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The effective rate of maintenance treatments adopting different frequency of administration |  | up to 16 weeks per subject | 
| Number of subjects with Adverse Events as a Measure of Safety |  | up to 18 weeks per subject | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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ITP, rhTPO