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Clinical Trials |
Division of Oncology, University of Washington, Seattle, Washington, 98195-6527 [M. L. D.], and Corixa Corporation, Seattle, Washington 98104 [K. H. G., P. R. S., M. A. C.]
HER-2/neu is a "self" tumor antigen that is overexpressed in 1530% of human adenocarinomas. Vaccine strategies directed against HER-2/neu and other self tumor antigens require development of methods to overcome immune tolerance to self-proteins. In rats, rat neu peptide vaccines have been shown to be an effective way of circumventing tolerance to rat neu protein and generating rat neu-specific immunity. The present report validates that a similar peptide-based vaccine formulation is effective for inducing T-cell immunity to HER-2/neu protein in humans with breast and ovarian cancer. The vaccine formulation included groups of peptides derived from the HER-2/neu extracellular domain (ECD) or intracellular domain (ICD) mixed with granulocyte macrophage colony stimulating factor as an adjuvant. These peptides were 1518 amino acids in length and designed to elicit a CD4 T helper-specific immune response. Patients underwent intradermal immunization once a month for a total of two to six immunizations. To date, all of the patients immunized with HER-2/neu peptides developed HER-2/neu peptide-specific T-cell responses. The majority of patients (six of eight) also developed HER-2/neu protein-specific responses. Responses to HER-2/neu protein occurred with epitope spreading. Immune T cells elicited by vaccination were shown to migrate outside the peripheral circulation by virtue of generating delayed type hypersensitivity responses distant from the vaccine site, which indicated the potential ability to traffic to the site of tumor. The use of peptide-based vaccines may be a simple, yet effective, vaccine strategy for immunizing humans to oncogenic self-proteins.
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M. L. Disis, K. Schiffman, T. A. Gooley, D. G. McNeel, K. Rinn, and K. L. Knutson Delayed-Type Hypersensitivity Response Is a Predictor of Peripheral Blood T-Cell Immunity after HER-2/neu Peptide Immunization Clin. Cancer Res., April 1, 2000; 6(4): 1347 - 1350. [Abstract] [Full Text] |
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