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CD79a, a component of the B-cell antigen receptor complex, can also be expressed in certain non-B-cell malignancies. The reported frequency of CD79a expression in acute myeloid leukemias (AML) ranges from 0% to 90%. We evaluated 39 bone marrow biopsy specimens (29 AML and 10 normal cases) using 5 different commercially available anti-CD79a monoclonal antibody (MoAb) clones. Of 7 acute promyelocytic leukemia (APL) cases, 6 (86%) stained for CD79a with clones HM47/A9 (Novocastra, Newcastle Upon Tyne, England) and HM57 (DAKO, Carpinteria, CA) but were negative with clones 11E3 (Novocastra), and JCB117 (DAKO). Half of 6 acute megakaryoblastic leukemia (AMKL) cases and normal megakaryocytes in 14 (67%) of 21 cases were immunoreactive using clone 11D10 (Novocastra). Approximately one third of non-APL/non-AMKL AML and myeloid precursors in normal marrow specimens stained with clones HM57 and 11D10. This heterogeneity of CD79a expression in AML, megakaryocytes, and myeloid precursors is MoAb clone-dependent, likely owing to different epitope detection, and may be of diagnostic usefulness.

CD79a Is Heterogeneously Expressed in Neoplastic and Normal Myeloid Precursors and Megakaryocytes in an Antibody Clone–Dependent Manner