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Immunoglobulin class and immunoglobulin G subclass analysis of human anti-mouse antibody response during monoclonal antibody treatment of cancer patients.

Hervé M. Blottière, Jean‐Yves Douillard, Hilary Koprowski, Zenon Steplewski

Abstract

The immune response against murine IgG2a immunoglobulin was studied in 42 gastrointestinal cancer patients treated with mouse monoclonal antibodies. IgM, IgA, and all 4 IgG subclasses directed against mouse immunoglobulin were studied. Thirty of 42 patients developed an anti-mouse response of IgG isotype, often associated with IgM and IgA specific for mouse monoclonal antibodies circulating in serum. Patients first developed an IgM response, followed by IgA and IgG. IgG1 was found to be the most frequently expressed isotype, followed by IgG2 and IgG3. IgG4 was detected in only 6 patients.

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Key concepts: Subclass, Isotype, Antibody, Immunoglobulin class switching, Immunology, Monoclonal antibody, Immunoglobulin G, Immune system