title: Molecular and immunological evaluation of the expression of cancer/testis gene products in human colorectal cancer.
abstract: Tumor-specific gene products, such as cancer/testis (CT) antigens, constitute promising targets for the development of T cell vaccines. Whereas CT antigens are frequently expressed in melanoma, their expression in colorectal cancers (CRC) remains poorly characterized. Here, we have studied the expression of the CT antigens MAGE-A3, MAGE-A4, MAGE-A10, NY-ESO-1 and SSX2 in CRC because of the presence of well-described HLA-A2-restricted epitopes in their sequences. Our analyses of 41 primary CRC and 14 metastatic liver lesions confirmed the low frequency of expression of these CT antigens. No increased expression frequencies were observed in metastatic tumors compared to primary tumors. Histological analyses of CRC samples revealed heterogeneous expression of individual CT antigens. Finally, evidence of a naturally acquired CT antigen-specific CD8(+) T cell response could be demonstrated. These results show that the expression of CT antigens in a subset of CRC patients induces readily detectable T cell responses.
authors.affiliation: NCCR, Molecular Oncology, ISREC, Ch. des Boveresses 155, 1066 Epalinges, Switzerland.
authors.forename: Pedro M S
authors.initials: PM
authors.lastname: Alves
authors.forename: Nicole
authors.initials: N
authors.lastname: Lévy
authors.forename: Hanifa
authors.initials: H
authors.lastname: Bouzourene
authors.forename: Sébastien
authors.initials: S
authors.lastname: Viatte
authors.forename: Gabriel
authors.initials: G
authors.lastname: Bricard
authors.forename: Maha
authors.initials: M
authors.lastname: Ayyoub
authors.forename: Henri
authors.initials: H
authors.lastname: Vuilleumier
authors.forename: Jean-Claude R
authors.initials: JC
authors.lastname: Givel
authors.forename: Nermin
authors.initials: N
authors.lastname: Halkic
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Speiser
authors.forename: Pedro
authors.initials: P
authors.lastname: Romero
authors.forename: Frédéric
authors.initials: F
authors.lastname: Lévy
mesh_terms: D000951:Antigens, Neoplasm / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D015179:Colorectal Neoplasms / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D015870:Gene Expression; D020869:Gene Expression Profiling; D006801:Humans; D007150:Immunohistochemistry; D008113:Liver Neoplasms / Q000378:metabolism / Q000556:secondary; D008297:Male; D009363:Neoplasm Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000951:Antigens, Neoplasm; D009363:Neoplasm Proteins