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pubmed-article:14676632pubmed:abstractTextSuccessful immunotherapy with peptide vaccines depends on the in vivo generation of sufficient numbers of anti-tumor T cells with appropriate phenotypic and functional characteristics to mediate tumor destruction. Herein, we report the induction of high frequencies of circulating CD8+ T cells (4.8% to 38.1%) directed against the native gp100:209-217 peptide derived from the gp100 melanoma-melanocyte tumor antigen in five HLA-A*0201 patients at high risk of recurrence of melanoma after multiple courses of immunization with modified gp100:209-217(210M) peptide in IFA. Longitudinal peripheral blood mononuclear cell (PBMC) analysis revealed a phenotypic shift of native peptide-specific CD8+ T cells from an early effector to an effector memory (CD27- CD28- CD62L- CD45RO+) phenotype with repeated immunizations and functional maturation that correlated with gp100:209-217 peptide-specific T-cell precursor frequencies. Postimmunization PBMC exhibited direct ex vivo recognition of melanoma cell lines in ELISPOT analysis, showed lytic capability against peptide-pulsed target cells, and proliferated in response to native peptide stimulation. One year after final immunization, circulating vaccine-specific CD8+ T cells persisted in patients' PBMC with a maintained effector memory phenotype. The results herein demonstrate the efficacy of a multiple course peptide-immunization strategy for the generation of high frequencies of tumor antigen-specific T cells in vivo, and further show that continued peptide immunization results in the escalating generation of functionally mature, tumor-reactive effector memory CD8+ T lymphocytes.lld:pubmed
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pubmed-article:14676632pubmed:pagination36-47lld:pubmed
pubmed-article:14676632pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:14676632pubmed:articleTitlePhenotypic and functional maturation of tumor antigen-reactive CD8+ T lymphocytes in patients undergoing multiple course peptide vaccination.lld:pubmed
pubmed-article:14676632pubmed:affiliationSurgery Branch, National Cancer Institutes of Health, Bethesda, MD 20892, USA.lld:pubmed
pubmed-article:14676632pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:14676632pubmed:publicationTypeEvaluation Studieslld:pubmed
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