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Blood. 2003 Aug 1;102(3):1070-1. Epub 2003 Apr 17.

CD20 is associated with a small mature plasma cell morphology and t(11;14) in multiple myeloma.

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  • 1Laboratory of Hematology and Institut National de la Santé et de la Recherche Médicale (INSERM) U463, Institute of Biology, Nantes, France.


CD20 has been reinvestigated in 66 patients with multiple myeloma (MM). Twelve of the patients (18%) expressed CD20, including 5 of 50 patients at diagnosis presenting 100% CD20+ cells. Seven (58%) of 12 CD20+ patients with MM had a small mature plasma cell morphology as opposed to 4 (7%) of 54 with CD20- MM (P =.0001). Of note, 10 (83%) of 12 patients with CD20+ MM had t(11;14) as opposed to 5 of 54 (9%) CD20- patients (P <.001). All the patients with 100% CD20+ cells presented with t(11;14) and 4 of 5 with a small mature plasma cell morphology. Thus, 66% of the patients with t(11;14) expressed CD20, whereas only 4% of the 51 patients lacking such translocation expressed CD20 (P <.0001). In conclusion, CD20 expression is associated with small mature plasma cell morphology and with t(11;14) in patients with MM.

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