Identification of epidermal growth factor receptor-derived peptides immunogenic for HLA-A2+ cancer patients

H Shomura, S Shichijo, S Matsueda… - British journal of …, 2004 - nature.com
H Shomura, S Shichijo, S Matsueda, T Kawakami, Y Sato, S Todo, K Itoh
British journal of cancer, 2004nature.com
Epidermal growth factor receptor (EGFR) is one of the most appropriate target molecules for
cancer therapy because of its relatively high expression in about one-third of all epithelial
cancers in correlation with neoplasmic progression. With respect to EGFR-targeted
therapies, antibodies and tyrosine-kinase inhibitors have been intensively studied, a novel
EGFR-tyrosine-kinase inhibitor ZD1839 has been approved as an anticancer drug, and
many other agents are now under clinical trial. In addition, cytotoxic T lymphocyte (CTL) …
Abstract
Epidermal growth factor receptor (EGFR) is one of the most appropriate target molecules for cancer therapy because of its relatively high expression in about one-third of all epithelial cancers in correlation with neoplasmic progression. With respect to EGFR-targeted therapies, antibodies and tyrosine-kinase inhibitors have been intensively studied, a novel EGFR-tyrosine-kinase inhibitor ZD1839 has been approved as an anticancer drug, and many other agents are now under clinical trial. In addition, cytotoxic T lymphocyte (CTL)-directed epitope peptides could be another class of compounds useful in EGFR-targeted therapies. However, there is presently no information on CTL-directed peptides of EGFR. Therefore, from the viewpoint of development of peptide-based cancer therapy, this study was intended to determine the EGFR-derived peptides recognised by both cellular and humoral immunities in HLA-A2+ epithelial cancer patients. We herein report finding of two such types of EGFR-derived peptides at position 479–488 and 1138–1147, both of which were recognised by the majority of patients' sera (IgG), and also possessed the ability to induce HLA-A2-restricted peptide-specific CTLs against EGFR-positive tumour cells in peripheral blood mononuclear cells (PBMCs) of epithelial cancer patients. These results may provide a scientific basis for the development of EGFR-based immunotherapy for HLA-A2+ cancer patients.
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