Abstract
Multiple myeloma (MM) is characterized by accumulation of clonal plasma cells (PCs). CD45, a key regulator of antigen-mediated signaling and activation in lymphocytes, is present in early stages of PCs development. We studied CD45 expression on MM PCs by flow cytometry, correlating it to important biological disease characteristics. Additionally, we examined the expression of various adhesion molecules on PCs. A total of 75 patients with untreated MM (29), relapsed MM (17), smoldering MM (12), and monoclonal gammopathy of undetermined significance (MGUS) (17) were studied. The proportion of PCs expressing CD45 was higher among those with early disease (MGUS or smoldering MM) compared to those with advanced disease (new or relapsed MM) (43 vs 22%; P=0.005). Among those with advanced disease, patients with bone lesions had a lower percentage of CD45-positive (CD45+) PCs; 14 vs 34% (P=0.02). Patients with high-grade angiogenesis had a lower percentage of CD45+ PCs; 13 vs 31% (P=0.03). The median overall survival for the CD45+ group (>20% PCs positive) was 39 vs 18 months for the CD45-negative (CD45−) group (P=0.07). The expression of CD138, CD56 and CD54 were higher among the CD45− PCs. This study demonstrates important biological correlates of CD45 expression on myeloma cells.
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Acknowledgements
This study was supported in part by CA62242, CA107476, CA93842, CA100080, CA97274 and CN65125 from the National Cancer Institute, Bethesda, MD; and also supported in part by the Multiple Myeloma Research Foundation, the Goldman Philanthropic Partnerships and the Leukemia and Lymphoma Society.
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Kumar, S., Rajkumar, S., Kimlinger, T. et al. CD45 expression by bone marrow plasma cells in multiple myeloma: clinical and biological correlations. Leukemia 19, 1466–1470 (2005). https://doi.org/10.1038/sj.leu.2403823
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DOI: https://doi.org/10.1038/sj.leu.2403823
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