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Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, University Hospital, 1011 Lausanne, Switzerland [D. V., V. D., V. R-G., D. L., P. R., J-C. C.]; Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, 1066 Epalinges, Switzerland [C. C., D. R.]; and Multidisciplinary Oncology Center, University Hospital, 1011 Lausanne, Switzerland [P. G.]
MAGE genes encode tumor-specific shared antigens that are among the most interesting candidates for cancer vaccines. Despite extensive studies, however, CD8+ T-cell responses to MAGE-derived epitopes have been detected only occasionally in cancer patients, even after vaccination. In contrast with these findings, we report here that HLA-A2 melanoma patients respond frequently to the recently identified peptide MAGE-A10254262. Indeed, as assessed by staining with fluorescent HLA-A2/peptide MAGE-A10254262 tetramers, CD8+ T cells directed against this peptide were readily detectable in a large proportion of HLA-A2+ melanoma patients. These results provide new insight into the immunogenicity of MAGE antigens and underline the potential usefulness of MAGE-A10 peptide-based cancer vaccines.
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