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- W2104618745 abstract "Vaccination with tumor antigens causes tumor regression in some melanoma patients despite negligible expansion of vaccine-specific T cells. Vaccination may instead result in the expansion of T cells specific for tumor antigens not contained in the vaccine, thus facilitating tumor regression, according to two articles from Pierre Coulie and colleagues on pages 241 and 249.Figure Tumor-specific T cells (red) infiltrate a tumor after vaccination.Tumor-specific T cells can be detected in the blood and the tumors of many melanoma patients, and yet these cells are unable to kill the tumor. What causes the impotence of these T cells is a mystery. Equally mysterious is why vaccination against tumor-specific antigens sometimes causes regression without expanding large numbers of vaccine-specific killer T cells.Pierre Coulie's group studied the specificity of antitumor T cell responses in patients vaccinated with a tumor antigen called MAGE-3. In one patient whose tumors regressed after vaccination, the authors found that T cells specific for nonvaccine tumor antigens became detectable or expanded from their prevaccine frequencies. Vaccine-specific T cells became detectable but remained at low frequency. Thus, reinvigoration of existing tumor-specific T cells and activation of new T cells after vaccination does not require large numbers of vaccine-specific T cells.Although the mechanism underlying this phenomenon remains unknown, Coulie thinks that the few T cells stimulated by the vaccine may change the local environment of the tumor such that existing T cells can be reactivated and new T cells can be recruited." @default.
- W2104618745 created "2016-06-24" @default.
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- W2104618745 date "2005-01-17" @default.
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- W2104618745 title "Jump-starting tumor-specific T cells" @default.
- W2104618745 doi "https://doi.org/10.1084/jem2012iti4" @default.
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