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Ever since monoclonal antibodies were produced in 1975 with mouse myeloma cells there has been interest in developing human myeloma cultures for the production of monoclonal antibodies. However, despite multiple attempts, no human myeloma line suitable for hybridoma production has been described. Here we report the derivation of a hypoxanthine-aminopterin-thymidine-sensitive and ouabain-resistant human myeloma cell line (Karpas 707H) that contains unique genetic markers. We show that this line is useful for the generation of stable human hybridomas. It can easily be fused with ouabain-sensitive Epstein-Barr virus-transformed cells as well as with fresh tonsil and blood lymphocytes, giving rise to stable hybrids that continuously secrete very large quantities of human immunoglobulins. The derived hybrids do not lose immunoglobulin secretion over many months of continuous growth. The availability of this cell line should enable the in vitro immortalization of human antibody-producing B cells that are formed in vivo. The monoclonal antibodies produced may have advantages in immunotherapy.

A human myeloma cell line suitable for the generation of human monoclonal antibodies