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- W2090867462 abstract "In a study of 870 individual patients with either lymphocytosis (excluding known lymphoproliferative disease), increased proportions of blood lymphocytes with granular morphology (LGL), or neutropenia, 14 cases were found with abnormally increased CD3+CD4+CD8+ components. Eleven of these were further investigated and 10 shown in follow-up studies to be persistent in nature. Morphological assessments revealed increased LGL in 9/11 cases, and in seven of these > 50% lymphocytes had discernable cytoplasmic granulation. Immunophenotypic studies indicated that CD8 expression by CD4+ lymphocytes in these patients was of low density (CD8dim+), and that both the CD4+CD8- and CD4+CD8dim+ fractions in each patient was characterized by a CD11b+CD16-CD56+CD57+ composite NK-associated (NKa) phenotype (in contrast to normal CD4+CD8- blood lymphocytes and CD4+CD8+ thymocytes which were consistently CD11b-CD16-CD56-CD57-). TCR genotypic studies revealed rearranged components (beta plus gamma, or beta alone) in 5/11 cases, but there were no obvious relationships between TCR configuration (including rearranged band densities) and immunophenotypes, absolute lymphocyte or neutrophil numbers, the proportions of blood LGL, or the proportions of CD4+ cells coexpressing CD8. The occurrence of identical NKa phenotypic profiles in both germline and rearranged TCR cases does, however, suggest the possibility of an evolutionary process from a non-clonal expansion to a clonal state. Serum studies, including soluble CD4, CD8 and IL2-R concentrations and autoantibody investigations, of representative germline and rearranged TCR cases failed to indicate any consistent abnormalities, but there was some suggestion for the existence of a chronic reactive process in some of the patients with germline TCR. These findings suggest that expanded LGL/NKa+ components with phenotypic evidence of CD4/CD8 coexpression should be regarded as a distinct diagnostic category and that persistent CD4+CD8+ abnormalities with germline TCR should be monitored for possible clonal transition." @default.
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- W2090867462 date "1992-11-01" @default.
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- W2090867462 title "A distinct large granular lymphocyte (LGL)/NK-associated (NKa) abnormality characterized by membrane CD4 and CD8 coexpression" @default.
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- W2090867462 doi "https://doi.org/10.1111/j.1365-2141.1992.tb06458.x" @default.
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