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• W2029593442 abstract "Objective To attempt to distinguish cases of true malignant histiocytosis from the clinical syndromes of so called malignant histiocytosis with use of recent methods. Design We retrospectively studied the laboratory data and clinical course of Mayo patients who had clinical syndromes of so-called malignant histiocytosis and reviewed available paraffin-embedded tissue specimens to identify the nature of the malignant cells. Material and Methods After elimination of cases of infection-associated hemophagocytic syndrome, we reviewed and studied seven cases of so-called malignant histiocytosis in patients who had undergone assessment at Mayo Clinic Rochester between 1973 and 1993 We identified histiocytes by using current morphologic, cytochemical, and immunohistochemical methods. The clonal nature of the malignant cells was identified with morphologic, cytogenetic, and molecular genetic studies. Results Only one of the seven cases had a true histiocytic origin. The malignant cells were T cells in three other cases (the cells were also CD30+ in two cases), CD30+ cells only in one case, epithelial cells in one case, and an undetermined cell type (stained positively only with antitrypsin) in one case. Conclusion True malignant histiocytosis is an exceedingly rare disease, and only a few reports have clearly identified the histiocytic origin of the malignant cells. Previously, the lack of monoclonal antibodies specific to histiocytes and the absence of techniques for performing molecular genetic studies on paraffin-embedded tissue prevented the study of such cases. With newer techniques, cases of true malignant histiocytosis can now be identified. To attempt to distinguish cases of true malignant histiocytosis from the clinical syndromes of so called malignant histiocytosis with use of recent methods. We retrospectively studied the laboratory data and clinical course of Mayo patients who had clinical syndromes of so-called malignant histiocytosis and reviewed available paraffin-embedded tissue specimens to identify the nature of the malignant cells. After elimination of cases of infection-associated hemophagocytic syndrome, we reviewed and studied seven cases of so-called malignant histiocytosis in patients who had undergone assessment at Mayo Clinic Rochester between 1973 and 1993 We identified histiocytes by using current morphologic, cytochemical, and immunohistochemical methods. The clonal nature of the malignant cells was identified with morphologic, cytogenetic, and molecular genetic studies. Only one of the seven cases had a true histiocytic origin. The malignant cells were T cells in three other cases (the cells were also CD30+ in two cases), CD30+ cells only in one case, epithelial cells in one case, and an undetermined cell type (stained positively only with antitrypsin) in one case. True malignant histiocytosis is an exceedingly rare disease, and only a few reports have clearly identified the histiocytic origin of the malignant cells. Previously, the lack of monoclonal antibodies specific to histiocytes and the absence of techniques for performing molecular genetic studies on paraffin-embedded tissue prevented the study of such cases. With newer techniques, cases of true malignant histiocytosis can now be identified." @default.
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• W2029593442 title "True Malignant Histiocytosis" @default.
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• W2029593442 doi "https://doi.org/10.4065/73.6.520" @default.
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