Summary
Light scattering properties and antigen distribution of lymphocytes labeled with the monoclonal antibodies CD 5 and CD 20 were determined for 19 patients with a chronic B-cell derived leukaemia. The density of the antigen detected by the monoclonal antibody CD 5 appeared to be considerably lower on malignant B-lymphocytes of the patients as compared with T lymphocytes. A large variation was observed in the amount of receptors for the monoclonal antibodies CD 5 and CD 20 on the malignant cells of the different patients. B-cell chronic lymphocytic leukaemia (B-CLL) patients were clearly distinguishable from leukaemic follicular non Hodgkin lymphoma patients (LF-NHL, formerly lymphosarcoma cell leukaemia) and from a patient with a prolymphocytoid transformation (PLT) of the B-CLL according to the amount of the antigens for CD 5 and CD 20. Within the B-CLL patient population, no relation of progression of the disease with distribution of these antigens could be observed. In one patient the extraordinary phenotype CD 20+, CD 11+, leu 8+, CD 5− of the malignant lymphocytes was observed. An experimentally simple method to differentiate between the various chronic lymphocytic leukaemias (CLL) appeared to be the determination of orthogonal light scattering properties of lymphocytes. In healthy donors one can always distinguish two populations of lymphocytes in the orthogonal light scatter histograms. Lymphocytes of B-CLL patients show one uniform population with a relatively small orthogonal light scattering signal, lymphocytes of our patients with PLT of B-CLL or with LF-NHL show one uniform population with a relatively large orthogonal light scattering signal.
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Terstappen, L.W.M.M., de Grooth, B.G., van Berkel, W. et al. Flow cytometric characterization of chronic lymphocyte leukaemias using orthogonal light scattering and quantitative immunofluorescence. Blut 56, 201–208 (1988). https://doi.org/10.1007/BF00320106
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DOI: https://doi.org/10.1007/BF00320106