EXPRESSION PATTERNS OF CD90, CD117, CD123, AND CD147 IN MATURE B CELL NEOPLASMS

Summary. Aim: to analyze the expression patterns of CD90, CD117, CD123, and CD147 on cells of the mature B-cell neoplasms, in particular marginal zone lymphoma (MZL) and mantle cell lymphoma (MCL) and the expression of CD147 on chronic lymphocytic leukemia (CLL) cells. Object and methods: the expression patterns of the surface antigens on the transformed B cells were analyzed in the peripheral blood samples of the MZL, MCL, and CLL patients (34 patients in total) by the flow cytometry using the monoclonal antibodies. Results: at least one of the antigens – CD90, CD117, or CD123 was expressed in 20.0–33.3% of MCL cases and 27.2–54.5% of MZL cases at the level ≥ 1% of the cells in the subpopulation of CD45-positive lymphoid cells. One MCL case demonstrated the high content of CD117-positive cells (31.0%) accompanied by CD90 expression on 3.8% of cells. The high content of the CD147-positive cells was found not only in MZL and MCL but also in CLL. Conclusion: a small fraction of cells of lymphoid neoplasms expresses several antigens of the leukemic stem cells and cells of the myeloid lineage. The ubiquitous pattern of CD147 expression on cells of these neoplasms has been demonstrated. The diagnostic and prognostic significance of the expression of the studied antigens remains unknown necessitating further clinical studies of the clinical features of these diseases taking into account the expression of the atypical markers.