- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03377439
The Association Between Platelet Reactivity and Bleeding Risk in Adult ITP
The Association Between Platelet Reactivity and Bleeding Risk in Adult ITP Patients: a Prospective Multicenter Double-blind Study
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The investigators are undertaking a prospective multicenter double-blind study of 400 adult patients with immune thrombocytopenia from 6 medical centers in China. We adopted three different assays that examined platelet function and reactivity. 1) Flow cytometry: Citrate anticoagulated whole blood was diluted in PBS to result in 20×10^9/L platelets, and 20 μl was aliquoted into polystyrene test tubes. Ten microliters of anti-CD42b-PE was added and incubated at room temperature for 10 min. Agonists (TRAP-6 12.5 μMol/L, Collagen 20 μg/mL, ADP 2 μM, Epinephrin 20 μM, Arachidonic acid 0.275 mM, Ristocetin 1.5 mg/mL) or PBS were added (10 μl each) and incubated again for 10 min. Then mAb PAC-1-FITC or anti-CD62p-FITC (10 μl each) or the corresponding isotype-matched controls were added. After 15-min incubation in the dark, the reaction was stopped with 500 μl PBS. Samples were analyzed on a flow cytometer (FACScan, Becton-Dickinson) by measuring 10,000 events in the CD42b-positive fraction. 2) Filopodia quantification: Briefly, platelets in Tyrode's buffer were allowed to adhere to VWF (9×10^6 cells/coverslip) in the presence of botrocetin (1 μg/mL) and Integrilin (40 μg/mL) at 37°C. After 15 min, non-adherent platelets were removed by washing and adherent platelets were fixed with 4% PFA, stained with TRITC-phalloidin (2 μg/mL) and viewed by epifluorescence microscopy for filopodia count. 3) Platelet aggregation: Measured on an automated platelet aggregation analyzer.
Understanding bleeding risk and underlying determinants of bleeding is important in order to help recognize patients that will require pharmacologic therapy even at higher platelet counts. Previous studies have suggested that low platelet counts, increased patient age, use of concurrent medications, and male sex are associated with increased bleeding risk. The present investigation will answer whether platelet function predicts the severity of bleeding in adult ITP patients. Clinical information of recruited participants includes gender, age, platelet count and physical/laboratory examination. Blinding was set between investigators who evaluated bleeding risks and those who performed experiments.
Study Type
Enrollment (Anticipated)
Contacts and Locations
Study Locations
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Shandong
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Jinan, Shandong, China, 250012
- Recruiting
- Qilu Hospital, Shandong University
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Principal Investigator:
- Ming Hou, MD, PhD
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- Untreated adult ITP patients of both genders between the ages of 18 and 80 years.
- Participants of either acute or chronic phase; with or without thrombocytopenia; with or without bleeding manifestation.
Exclusion Criteria:
- Received high-dose steroids or IVIG within 3 weeks prior to the test.
- Received second-line ITP-specific treatments (eg, cyclophosphamide, 6-mercaptopurine, vincristine, vinblastine, etc) within 3 months prior to the test.
- Current HIV infection, hepatitis B virus or hepatitis C virus infections.
- Severe medical condition (liver and kidney function impairment).
Study Plan
How is the study designed?
Design Details
- Observational Models: Cohort
- Time Perspectives: Prospective
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Group A
Participants with platelet counts <32×10^9/L.
|
Platelet reactivity was measured by flow cytometry, filopodia detection and the platelet aggregation analyzer.
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Group B
Participants with platelet counts between 32×10^9/L and 132×10^9/L.
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Platelet reactivity was measured by flow cytometry, filopodia detection and the platelet aggregation analyzer.
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Group C
Participants with platelet counts >132×10^9/L.
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Platelet reactivity was measured by flow cytometry, filopodia detection and the platelet aggregation analyzer.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
The severity of bleeding manifestations at onset was assessed using a previously described clinical scoring system with minor modifications. The total bleeding score was calculated by adding the scores for each item.
Time Frame: No more than three months after platelet function assessment.
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The bleeding score system: 1) Age: Age over 65 years (2'); Age over 75 years (5').
2) Cutaneous bleeding: Localized petechial purpura (1'); Localized ecchymotic purpura (2'); Two locations of petechial purpura (2'); Generalized petechial purpura (3'); Generalized ecchymotic purpura (4').
3) Mucosal bleeding: Unilateral epistaxis (2'); Bilateral epistaxis (3'); Hemorrhagic oral bullae and/or gingival bleeding (5').
4) Gastrointestinal bleeding: Gastrointestinal hemorrhage without anemia (4'); Gastrointestinal hemorrhage with acute anemia and/or shock (15').
5) Urinary bleeding: Macroscopic hematuria without anemia (4'); Macroscopic hematuria with acute anemia (10').
6) Genitourinary tract bleeding: Major meno/metrorrhagia without anemia (4'); Major meno/metrorrhagia with acute anemia (10').
7) Central nervous system bleeding: Central nervous system bleeding and/or life-threatening hemorrhage (15').
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No more than three months after platelet function assessment.
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Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Study Director: Jun Peng, MD, PhD, Qilu Hospital, Shandong University
Publications and helpful links
General Publications
- Khellaf M, Michel M, Schaeffer A, Bierling P, Godeau B. Assessment of a therapeutic strategy for adults with severe autoimmune thrombocytopenic purpura based on a bleeding score rather than platelet count. Haematologica. 2005 Jun;90(6):829-32.
- Middelburg RA, Roest M, Ham J, Coccoris M, Zwaginga JJ, van der Meer PF. Flow cytometric assessment of agonist-induced P-selectin expression as a measure of platelet quality in stored platelet concentrates. Transfusion. 2013 Aug;53(8):1780-7. doi: 10.1111/trf.12001. Epub 2012 Dec 7.
- Middelburg RA, Carbaat-Ham JC, Hesam H, Ragusi MA, Zwaginga JJ. Platelet function in adult ITP patients can be either increased or decreased, compared to healthy controls, and is associated with bleeding risk. Hematology. 2016 Oct;21(9):549-51. doi: 10.1080/10245332.2016.1180097. Epub 2016 May 9.
- Panzer S, Hocker L, Koren D. Agonists-induced platelet activation varies considerably in healthy male individuals: studies by flow cytometry. Ann Hematol. 2006 Feb;85(2):121-5. doi: 10.1007/s00277-005-0029-5. Epub 2005 Nov 10.
- Panzer S, Rieger M, Vormittag R, Eichelberger B, Dunkler D, Pabinger I. Platelet function to estimate the bleeding risk in autoimmune thrombocytopenia. Eur J Clin Invest. 2007 Oct;37(10):814-9. doi: 10.1111/j.1365-2362.2007.01855.x. Epub 2007 Aug 28.
- Mangin P, Yuan Y, Goncalves I, Eckly A, Freund M, Cazenave JP, Gachet C, Jackson SP, Lanza F. Signaling role for phospholipase C gamma 2 in platelet glycoprotein Ib alpha calcium flux and cytoskeletal reorganization. Involvement of a pathway distinct from FcR gamma chain and Fc gamma RIIA. J Biol Chem. 2003 Aug 29;278(35):32880-91. doi: 10.1074/jbc.M302333200. Epub 2003 Jun 17.
- Maurer E, Tang C, Schaff M, Bourdon C, Receveur N, Ravanat C, Eckly A, Hechler B, Gachet C, Lanza F, Mangin PH. Targeting platelet GPIbbeta reduces platelet adhesion, GPIb signaling and thrombin generation and prevents arterial thrombosis. Arterioscler Thromb Vasc Biol. 2013 Jun;33(6):1221-9. doi: 10.1161/ATVBAHA.112.301013. Epub 2013 Apr 4.
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Pathologic Processes
- Immune System Diseases
- Autoimmune Diseases
- Hematologic Diseases
- Hemorrhagic Disorders
- Blood Coagulation Disorders
- Skin Manifestations
- Blood Platelet Disorders
- Thrombotic Microangiopathies
- Purpura, Thrombocytopenic
- Purpura
- Hemorrhage
- Purpura, Thrombocytopenic, Idiopathic
- Thrombocytopenia
Other Study ID Numbers
- Plt function and bleeding risk
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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