Diverse niches within multiple myeloma bone marrow aspirates affect plasma cell enumeration
2006
Summary A basic criterion for the diagnosis of multiple myeloma is plasma cell enumeration within the bone marrow (BM). This report showed that flow cytometry under-estimated the number of plasma cells in BM aspirates by an average of 60%, compared with morphological evaluation. The discrepancy was partially because BM smears contain cells associated with the lipidenriched spicules. In contrast, flow cytometry is performed on the BM fluid, which is depleted of the lipid-adhesive plasma cells. This discrepancy may point to different plasma cell subpopulations associated with diverse niches within the BM.
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