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Associated chronic lymphocytic leukemia and multiple myeloma: origin from a
single clone
JP Fermand, JM James, P Herait and JC Brouet
We investigated the clonal relationship of malignant cells in a patient
affected with both chronic lymphocytic leukemia (CLL) and multiple myeloma
(MM). CLL cells and malignant plasma cells synthesized IgG1 kappa and IgA
kappa molecules, respectively; these monoclonal Ig shared idiotypic
determinants, providing evidence that a single clonal disease occurred in
this patient. Furthermore, when leukemic CLL cells were driven to
differentiate in vitro to immunoblasts and plasma cells, a switch from IgG
to IgA occurred in a significant percentage of cells that were double
producers. These data suggest that, in some circumstances, CLL leukemic B
cells may reach a more mature state, leading to the occurrence of clinical
MM.
Volume 66,
Issue 2,
pp. 291-293,
08/01/1985
Copyright © 1985 by The American Society of Hematology

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