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J. Exp. Med.,
Volume 187, Number 3, February 2, 1998 277-288
By



From the * Departments of Immunology and Except for melanomas, tumor antigens recognized by cytotoxic T lymphocytes (CTLs) are yet
unidentified. We have identified a gene encoding antigenic peptides of human squamous cell
carcinomas (SCCs) recognized by human histocompatibility leukocyte antigens (HLA)-
A2601-restricted CTLs. This gene showed no similarity to known sequences, and encoded
two (125- and 43-kilodalton [kD]) proteins. The 125-kD protein with the leucine zipper motif
was expressed in the nucleus of the majority of proliferating cells tested, including normal and
malignant cells. The 43-kD protein was expressed in the cytosol of most SCCs from various
organs and half of lung adenocarcinomas, but was not expressed in other cancers nor in a panel
of normal tissues. The three nonapeptides shared by the two proteins were recognized by the
KE4 CTLs, and one of the peptides induced in vitro from peripheral blood mononuclear cells
(PBMCs) the CTLs restricted to the autologous tumor cells. The 43-kD protein and this nonapeptide (KGSGKMKTE) may be useful for the specific immunotherapy of HLA-A2601+ epithelial cancer patients.
the Department of Surgery, Kurume University School of
Medicine, and the § Division of Cancer Vaccine, Kurume University Research Center for Innovative
Cancer Therapy, Kurume, 830, Japan
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