IMMUNOPHENOTYPIC PROFILE OF MALIGNANT B-LYMPHOCYTES OF PATIENTS WITH CHRONIC LYMPHOCYTIC LEUKEMIA OF DIFFERENT MORPHOLOGICAL VARIANTS
Aim: to determine the features of the expression of immunophenotypic markers on malignant B cells of typical and mixed cell type chronic lymphocytic leukemia. Object and methods: the studies were conducted on peripheral blood mononuclear cells separated by Lymphoprep gradient centrifugation of 32 patients with newly diagnosed and untreated chronic lymphocytic leukemia (CLL) (12 women and 20 men with the average age of 65.4 ± 1.7 years). The profile of the expression of surface antigens on leukemic B-cells of CLL cases was studied by flow cytometry. Results: it was determined that CLL of mixed cell type (CLL/PL), which has a worse prognosis than typical CLL (B-CLL), is characterized by a higher frequency of CD38-positive and CD150- and CD180-negative cases. The following differences in the immunophenotypic profile of malignant B cells of patients with CLL were revealed: among patients with CLL/PL, the mean percentage of positive B-cells for CD5, CD11c, CD22 is significantly higher, and CD23, CD40, CD150, and CD180 is lower than in В-CLL. In addition, a higher expression level of CD5, CD22 and a lower expression level of CD20 and CD23 are characteristics of leukemic B cells of patients with CLL/PL in comparison to B-CLL (p <0.05). Conclusion: B-CLL and CLL/PL differ in the expression profile of some immunophenotypic markers, the determination of which is expedient for prediction of the course of the disease and choosing the most effective therapy at the diagnostic stage.
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