A plasmocyte selective monoclonal antibody (B‐B4) recognizes syndecan‐1

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<jats:p>We developed a new monoclonal antibody, B‐B4, which specifically identifies human plasma cells. It strongly reacts with all multiple myeloma cell lines and with malignant plasma cells of all tumour samples of the multiple myeloma patients tested. B‐B4 does not react with any peripheral blood, bone marrow or tonsil cells. Cloning of the B‐B4 antigen reveals that the monoclonal antibody recognizes syndecan‐1. It appears that the monoclonal antibody B‐B4 is a suitable marker for human plasmocyte identification among haemopoietic cells and a useful probe for the diagnosis of haematological malignancies. Furthermore, this monoclonal antibody can be used for depletions prior to CD34 grafting.</jats:p>

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