Journal
CANCER SCIENCE
Volume 100, Issue 5, Pages 798-806Publisher
WILEY
DOI: 10.1111/j.1349-7006.2009.01137.x
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [16209013, 17016061, 15659097]
- Japan Science and Technology Agency
- Ministry of Health, Labor and Welfare [15-17, 19-14]
- Grants-in-Aid for Scientific Research [21590401] Funding Source: KAKEN
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Antigenic peptides derived from tumor-associated antigens (TAAs) facilitate peptide cancer vaccine therapies. With the recent progress in cancer immunity research, huge amounts of antigenic peptides have already been reported. Clinical trials using such peptides are underway now all over the world. Some reports have shown the efficacy of peptide vaccine therapies. However, others ended with unfavorable results, suggesting fundamental underlying problems. One major mechanism that negates the peptide vaccine therapy is tumor escape from immunological systems caused by loss of antigens. TAAs that are used in cancer vaccine therapies may be divided into two major groups: functioning antigens and non-functioning antigens. A 'functioning antigen' could be defined as a TAA that is essential for tumor growth, is expressed in several kinds of malignancies and shows homogenous expression in cancerous tissues. It is not difficult to imagine that antigen loss will occur easily with non-functioning antigens as a target of cancer vaccine therapy. Thus, it is essential to use functioning antigens for successful cancer vaccine therapy. In this review, we discuss the functioning antigens and their categorization in detail. (Cancer Sci 2009; 100: 798-806).
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