Abstract
In a variety of human tumors, including high grade Non-Hodgkin's lymphoma (hgNHL), a linkage between expression of CD44 variant isoforms (CD44v) and tumor progression has been described. In search of an easily accessible diagnostic parameter, expression of CD44 standard (CD44s) and CD44 variant isoforms (exons v5, v6, v7 and v10) in peripheral blood lymphocytes (PBLs) of patients with hematological malignancies was evaluated by fluorescence activated cell scanning. The analysis of 30 blood samples of healthy donors and patients with non-malignant diseases and of 183 blood samples of patients with malignant hematological disorders revealed that only in patients with malignant disorders did a measurable proportion of PBLs express CD44 variant isoforms, mostly exons v5, v6, v7 and, less frequently, exon v10. Elevated levels of CD44v expression were noted in PBLs of patients with acute and chronic myeloid leukemia (AML: 16%, CML: 25%), Hodgkin's disease (HD: 17%), multiple myeloma (MM: 22%), polycythemia vera (PV: 33%), acute lymphoid leukemia (ALL: 23%) and, most frequently, in PBLs of patients with non-Hodgkin's lymphoma (NHL:54%). CD44v expression was not restricted to the malignant phenotype, but instead was also noted in T cel...Continue Reading
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