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Clonal T cell-mediated cyclic thrombocytopenia
Wolfgang Füreder1, Gerlinde Mitterbauer, Renate Thalhammer
1Department of Internal Medicine I, Division of Haematology & Haemostaseology, The University of Vienna, Austria. vofuer@netway.at
British Journal of Haematology
|December 11, 2002
Summary
Cyclic thrombocytopenia, a rare disorder with fluctuating platelet counts, was linked to clonal T-cell abnormalities. Treatment with cyclosporine A improved platelet levels, suggesting T-cell mediated bone marrow failure.
Area of Science:
- Hematology
- Immunology
- Oncology
Background:
- Cyclic thrombocytopenia is a rare hematologic disorder characterized by recurrent, predictable drops in platelet counts.
- The underlying etiology of cyclic thrombocytopenia remains largely unknown, posing diagnostic and therapeutic challenges.
Observation:
- A female patient presented with dramatic cyclic fluctuations in platelet counts (6-753 x 10(9)/L) over 4-week intervals.
- Platelet count variations inversely correlated with thrombopoietin levels, indicating impaired platelet production.
- Concurrent, less pronounced fluctuations were observed in reticulocyte and neutrophil counts.
Findings:
- Bone marrow and peripheral blood samples revealed clonal T-cell receptor gene rearrangement.
- Flow cytometry demonstrated an increased proportion of CD3+ T cells in the patient's blood.
- Cyclosporine A therapy led to a significant and sustained improvement in platelet counts.
Implications:
- This case provides evidence for clonal T-cell mediated bone marrow failure as a cause of cyclic thrombocytopenia.
- The findings suggest that T-cell dysregulation can specifically impair thrombopoiesis in a cyclic manner.
- Cyclosporine A may be an effective therapeutic option for T-cell mediated cyclic thrombocytopenia.