Published online by Cambridge University Press: 30 January 2025
Malignant plasma cell proliferations are characterised by specific clinical, immunophenotypic and genetic features. Multiparameter flow cytometry (MFC) is an essential component of the diagnosis of these diseases. Clonal proliferations can be identified through their aberrant cell-surface immunophenotype or, more precisely, by demonstrating monotypy, i.e. selective expression of the same light chain in the cytoplasm of plasma-cells. This chapter reviews these immunophenotypic features, the technical points of caution to observe for proper use of MFC at diagnosis and during therapy to assess measurable residual disease.
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