An Epidemiological Study of Subjects With Immune Thrombocytopenic Purpura to Evaluate the Relationship Between Platelet Counts, Endogenous Thrombopoietin Levels, Endogenous Anti-Thrombopoietin Antibodies, and Selected Autoimmune Markers
| Tracking Information | |
|---|---|
| First Received Date ICMJE | April 22, 2000 |
| Last Updated Date | March 3, 2008 |
| Start Date ICMJE | April 2000 |
| Primary Completion Date | Not Provided |
| Current Primary Outcome Measures ICMJE | Not Provided |
| Original Primary Outcome Measures ICMJE | Not Provided |
| Change History | Complete list of historical versions of study NCT00005570 on ClinicalTrials.gov Archive Site |
| Current Secondary Outcome Measures ICMJE | Not Provided |
| Original Secondary Outcome Measures ICMJE | Not Provided |
| Current Other Outcome Measures ICMJE | Not Provided |
| Original Other Outcome Measures ICMJE | Not Provided |
| Descriptive Information | |
| Brief Title ICMJE | An Epidemiological Study of Subjects With Immune Thrombocytopenic Purpura to Evaluate the Relationship Between Platelet Counts, Endogenous Thrombopoietin Levels, Endogenous Anti-Thrombopoietin Antibodies, and Selected Autoimmune Markers |
| Official Title ICMJE | An Epidemiological Study of Subjects With Immune Thrombocytopenic Purpura to Evaluate the Relationship Between Platelet Counts, Endogenous Thrombopoietin Levels, Endogenous Anti-Thrombopoietin Antibodies, and Selected Autoimmune Markers |
| Brief Summary | This study involves the collection of blood samples from patients with immune thrombocytopenic purpura (ITP) to evaluate the relationship between platelet counts, blood levels of a hormone called thrombopoietin that controls platelet production by the bone marrow, and blood levels of antibodies against thrombopoietin that could interfere with the action of this hormone. Blood samples will also be stored if separately agreed to by the patient for analysis of genes that might affect platelet production. At a single outpatient clinic visit, patients will have a medical history taken, and blood samples drawn for testing. Results from this study may help further understand the control of platelet production in patients with ITP, and suggest new therapeutic approaches. |
| Detailed Description | This study involves the collection of blood samples from patients with immune thrombocytopenic purpura (ITP) to evaluate the relationship between platelet counts, blood levels of a hormone called thrombopoietin that controls platelet production by the bone marrow, and blood levels of antibodies against thrombopoietin that could interfere with the action of this hormone. Blood samples will also be stored if separately agreed to by the patient for analysis of genes that might affect platelet production. At a single outpatient clinic visit, patients will have a medical history taken, and blood samples drawn for testing. Results from this study may help further understand the control of platelet production in patients with ITP, and suggest new therapeutic approaches. |
| Study Type ICMJE | Observational |
| Study Design ICMJE | Not Provided |
| Target Follow-Up Duration | Not Provided |
| Biospecimen | Not Provided |
| Sampling Method | Not Provided |
| Study Population | Not Provided |
| Condition ICMJE |
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| Intervention ICMJE | Not Provided |
| Study Group/Cohort (s) | Not Provided |
| Publications * | Kelton JG, Gibbons S. Autoimmune platelet destruction: idiopathic thrombocytopenic purpura. Semin Thromb Hemost. 1982 Apr;8(2):83-104. Review. No abstract available. |
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* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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| Recruitment Information | |
| Recruitment Status ICMJE | Completed |
| Enrollment ICMJE | 200 |
| Completion Date | July 2000 |
| Primary Completion Date | Not Provided |
| Eligibility Criteria ICMJE | Diagnosis of ITP, based on the history, physical examination, complete blood count, and examination of the peripheral smear, which should exclude other causes of thrombocytopenia. These criteria for ITP are based on the American Society of Hematology practice guideline for ITP. Subjects 5 years of age or older. Before the study specific procedure, the subject or legally acceptable representative must give written informed consent(s) for participation in the study. No subjects with documented history of Human Immunodeficiency Virus (HIV) or Hepatitis. No subjects with known underlying causes of thrombocytopenia such as lupus erythematosus, autoimmune thyroid disorders, drug-induced thrombocytopenia, bone marrow disorders, and liver disease. No psychiatric or addictive disorders that compromise the subject's ability to give truly informed consent for participation in the study. |
| Gender | Both |
| Ages | Not Provided |
| Accepts Healthy Volunteers | No |
| Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects |
| Location Countries ICMJE | United States |
| Administrative Information | |
| NCT Number ICMJE | NCT00005570 |
| Other Study ID Numbers ICMJE | 000120, 00-H-0120 |
| Has Data Monitoring Committee | Not Provided |
| Responsible Party | Not Provided |
| Study Sponsor ICMJE | National Heart, Lung, and Blood Institute (NHLBI) |
| Collaborators ICMJE | Not Provided |
| Investigators ICMJE | Not Provided |
| Information Provided By | National Institutes of Health Clinical Center (CC) |
| Verification Date | April 2000 |
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ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |
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