Abstract
Peripheral blood from 38 B-CLL patients was studied by flow cytometry with 25 clustered or non-clustered monoclonal antibodies (moAbs) in order to characterize the cell surface phenotype of lymphoid cells. All moAbs chosen detected B or CD1-8 T-cell differentiation antigens or MHC class II antigens. The results showed a heterogeneity in the leukemic cell reactivity with the various moAbs and between patients. The restricted B-cell antigens recognized by BL14, Y2955 and anti-class II moAbs were constantly expressed in leukemic cells, while B-cell antigens reacting with FMC7 and BL13 moAbs were variably detected. In addition to CD5 antigens, other T-cell markers, including several epitopes of the CD1 group, were also found to be present on the leukemic cell surface in several cases. The relationship between the various clinical and/or biological features of the disease and the cell surface phenotype was studied. Our results indicated a correlation between the lymphoid cell reactivity with M241 (CD1) and BL13 (CD21) and the severity of the disease.
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