Clinical Evaluation of Eltrombopag in Chronic Idiopathic Thrombocytopenic Purpura (ITP)

Study Overview
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Brief Summary
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An open-label, dose-adjustment extension study to evaluate the safety and efficacy of eltrombopag for treatment of subjects with ITP who have previously been enrolled in the eltrombopag trial TRA108109 (NCT00540423).

Official Title
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Clinical Evaluation of Eltrombopag in Chronic Idiopathic Thrombocytopenic Purpura (ITP)-An Extension Study of Eltrombopag in Subjects, With Idiopathic Thrombocytopenic Purpura (ITP), Previously Enrolled in an Eltrombopag Study TRA108109 (NCT00540423)-<Phase III Study>

Conditions
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Idiopathic Thrombocytopenic Purpura, Purpura, Thrombocytopenic, Idiopathic

Intervention / Treatment
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* Drug: Eltrombopag oral tablets


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subject has signed and dated written informed consent. Subject (>=20 years) diagnosed with ITP. Subject previously enrolled in TRA108109 (NCT00540423) must have completed the treatment and follow-up periods as defined in that protocol. Subject has no intercurrent medical event at risk of thrombosis such as thrombophilia. Prolongation of prothrombin time and activated partial thromboplastin time (aPTT) must be within 1.2 times the upper limit of the normal range with no history of hypercoagulable state. A complete blood count (CBC), within the reference range, with the following exceptions: Hemoglobin: patients with haemoglobin level < the lower limit of normal are eligible for inclusion if hemorrhage is present. Neutrophil count >= 1,500/L (1.5x10E9/L) is required for inclusion. The following clinical chemistries MUST NOT exceed 1.2 times the upper limit of the normal reference range: creatinine, total bilirubin and alkaline phosphatase. The following clinical chemistries MUST NOT exceed 2 times the upper limit of the normal reference range: ALT and AST. Albumin must be not less than 80% of the lower limit of normal. Female subjects must either be: of non-childbearing potential (hysterectomy, bilateral oophorectomy, bilateral tubal ligation or post-menopausal > 1 year), or of childbearing potential and have a negative pregnancy test and agree to use contraceptive methods specified in the GSK List of Highly Effective Methods for Avoidance of Pregnancy from two weeks prior to administration of study medication, throughout the study, and 28 days after completion or premature discontinuation from the study: Reticulocyte count within the reference range or elevated in case of bleeding. Exclusion Criteria: Any severe medical condition (cardiac, hepatic or renal disorder) other than chronic ITP. (Note: Severe is defined as >= Grade 3 as a rule according to the Classification of the Severity of Adverse Experiences (PAB/SD Notification No.80, dated 29 June 1992) History of suspected or confirmed arterial or venous thrombosis (e.g., myocardial infarction, deep vein thrombosis) within the last 1 year. History of drug/alcohol abuse or dependence within the last 1 year. Suspected blood disorder other than ITP. Suspected platelet aggregation abnormality. Suspected cyclic thrombocytopenia. Suspected Evans Syndrome. Subjects who met the GSK Liver Stopping Criteria in the previous eltrombopag study TRA108109 (NCT00540423). Current or history of HIV infection or hepatitis B virus or hepatitis C virus infections. Current malignancy or history of malignancy that was treated with chemotherapy or radiotherapy. Female subjects who are nursing or pregnant, who may be pregnant, or who contemplate pregnancy during the study period. Subjects who are deemed unsuitable for the study by the investigator (or subinvestigator). Treatment with an investigational drug within 30 days preceding the first dose of study medication. Pre-existing cardiovascular disease, or arrhythmia known to increase the risk of thromboembolic events (e.g. atrial fibrillation).

Ages Eligible for Study
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Minimum Age: 20 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
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Treatment<br>Eltrombopag oral tablets once daily | Drug: Eltrombopag oral tablets<br>* Eltrombopag oral tablets once daily<br>* Other names: SB-497115-GR oral tablets;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Participants Experiencing an Adverse Event (AE) and/or Serious Adverse Event (SAE) Within the Indicated Category | An AE is any untoward medical occurrence in a participant, temporally associated with the use of a medical product, whether or not related to the product. An SAE is any untoward medical occurrence that, at any dose, results in death, is life-threatening, requires hospitalization or its prolongation, results in disability/incapacity, is a congenital anomaly/birth defect, or is another event considered serious. A drug-related AE is any AE that was judged to have a relationship with the study medication by the investigator. The severity of an AE is based on the investigator's clinical judgment. | From Baseline (Day 1) to last dose of eltrombopag/early withdrawal visit (up to 981 days) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants Achieving a Platelet Count Greater Than or Equal to 50 Giga Unit (10^9) Per Liter (Gi/L) and Less Than or Equal to 400 Gi/L | Platelet counts were measured by blood draw. | Baseline; Weeks 1, 2, 3, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, and 136; and last visit/early withdrawal visit (up to Day 982) | 
| Median Platelet Counts | Platelet counts were measured by blood draw. | Baseline; Weeks 1, 2, 3, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, and 136; and last visit/early withdrawal visit (up to Day 982) | 
| Percentage of Participants With a Given Maximum Number of Weeks of Continuous Platelet Count Evaluation Greater Than or Equal to 50 Gi/L and Greater Than or Equal to Twice the Baseline Count Categorized by Weeks on Study Medication (Med.) | Maximum continuous week (MCW) is measured as the longest period (weeks) for which a participant continuously maintained platelet counts greater than or equal to 50 Gi/L and greater than or equal to twice the Baseline count. | From Baseline (Day 1) to last dose of eltrombopag/early withdrawal visit (up to 981 days) | 
| Median Number of Maximum Continuous Weeks of Maintaining Platelet Counts Greater Than or Equal to 50 Gi/L and Greater Than or Equal to Twice the Baseline Count at Three-Month Intervals | Maximum continuous week is measured as the longest period (weeks) for which a participant continuously maintained platelet counts greater than or equal to 50 Gi/L and greater than or equal to twice the Baseline count. | 3, 6, 9, 12, 15, 18, 21, 24, 27, and 30 months (13, 26, 39, 52, 65, 78, 91, 104, 117, and 130 weeks) | 
| Percentage of Participants Experiencing Any Bleeding Episode After Dosing With Study Medication | Any bleeding(s) with an onset on or after the start date of study medication was recorded as a bleeding episode(s). | Baseline; Weeks 1, 2, 3, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, and 136; and last visit/early withdrawal visit (up to Day 982) | 
| Percentage of Participants With a Reduction in Use of Baseline Idiopathic Thrombocytopenic Purpura (ITP) Medication | Concomitant ITP medications included drugs such as steroids and immunosuppressive drugs. Reduction of concomitant ITP medication was defined as a reduction in dose and/or frequency of administration. | From Baseline (Day 1) to last dose of eltrombopag/early withdrawal visit (up to 981 days) | 
| Percentage of Participants Initiating Rescue Medication/Treatment During On-Therapy | Rescue therapy included new ITP medication, an increased dose of a concomitant ITP medication from Baseline (B/L), platelet transfusion, and splenectomy. | From Baseline (Day 1) to last dose of eltrombopag/early withdrawal visit (up to 981 days) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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eltrombopag, thrombopoietin receptor agonist, ITP, blood platelet