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From the * Ludwig Institute for Cancer Research, Brussels Branch, and Unité de Génétique Cellulaire,
Université Catholique de Louvain, B-1200 Brussels, Belgium; and the Of the antigens recognized on human tumors by autologous cytolytic T lymphocytes, all those
defined thus far have been identified on melanoma or renal cell carcinoma. We report here the
identification of an antigen recognized by autologous cytolytic T lymphocytes on a human
squamous cell carcinoma of the oral cavity. The antigen is encoded by a mutated form of the
CASP-8 gene. This gene, also named FLICE or MACH, codes for protease caspase-8, which is
required for induction of apoptosis through the Fas receptor and tumor necrosis factor receptor-1. The mutation, which was found in the tumor cells but not in the normal cells of the patient, modifies the stop codon and adds an Alu repeat to the coding region, thereby lengthening the protein by 88 amino acids. The ability of the altered protein to trigger apoptosis appears
to be reduced relative to the normal caspase-8. The antigenic peptide is a nonamer presented by HLA-B*3503. The five last amino acids are encoded by the extension of the reading frame
caused by the mutation. This, together with previous observations of CDK4 and
Institut Jules Bordet, Service
de Chirurgie, Université Libre de Bruxelles, B-1000 Brussels, Belgium
-catenin
mutations, suggests that a significant fraction of the point mutations generating a tumor antigen
also play a role in the tumoral transformation or progression.
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