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Overview
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CD23 antigen is a 45-60 kDa membrane glycoprotein identified as a low affinity receptor for IgEproduction as well as a receptor for lymphocyte growth factor. CD23 is found in some mature B-celllymphomas and in Reed-Sternberg cells in Hodgkin disease. Follicular dendritic cells and someactivated B-cells within germinal centers express CD23 in high density and mantle zone B-cells arestained weakly. The majority of chronic lymphocytic leukemias/small lymphocytic lymphomas are CD23positive, whereas mantle cell lymphomas are generally negative, so this marker is useful when appliedwith other markers to separate the small cell lymphomas. Precursor B and T lymphomas, myeloidneoplasms, and mature T-cell lymphomas are CD23 negative and other small cell lymphomas areoccasionally positive. CD23 is also positive on activated mature B-cells expressing IgM or IgD, monocytes/macrophages, follicular dendritic cells, T-cell subsets, eosinophils, Langerhans cells andsmall lymphocytic lymphoma/chronic lymphocytic leukemia (SLL/CLL).
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Overview