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• W1915022257 endingPage "2169" @default.
• W1915022257 startingPage "2161" @default.
• W1915022257 abstract "Abstract Adoptive T cell therapy has been successfully used for treatment of viral and malignant diseases. However, little is known about the fate and trafficking of transferred Ag-specific T cells. Using the tetramer (TM) technology which allows for detection and quantification of Ag-specific CTL, we assessed the frequency of circulating Melan-A-specific CTL in advanced melanoma patients during adoptive T cell therapy. Melan-A-specific CTL were generated from HLA-A2.1+ patients by in vitro stimulation of CD8+ T cells with dendritic cells pulsed with a mutated HLA-A2-binding Melan-A (ELAGIGILTV) peptide. Eight patients received three infusions of 0.25–11 × 108 Melan-A-specific CTL i.v. at 2-wk intervals along with low-dose IL-2. The transferred T cell product contained a mean of 42.1% Melan-A-TM+ CTL. Before therapy, the frequencies of Melan-A-specific CTL in patients’ circulating CD8+ T cells ranged from 0.01 to 0.07%. Characterization of the TM frequencies before and at different time points after transfer revealed an increase of circulating Melan-A-specific CTL up to 2%, correlating well with the number of transferred CTL. An elevated frequency of TM+ T cells was demonstrated up to 14 days after transfer, suggesting long-term survival and/or proliferation of transferred CTL. Combining TM analysis with a flow cytometry-based cytokine secretion assay, unimpaired production of IFN-γ was demonstrated in vivo for at least 24 h after transfer. Indium-111 labeling of Melan-A-specific CTL demonstrated localization of transferred CTL to metastatic sites as early as 48 h after injection. Overall, the results suggest that in vitro-generated Melan-A-specific CTL survive intact in vivo for several weeks and localize preferentially to tumor." @default.
• W1915022257 created "2016-06-24" @default.
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• W1915022257 date "2003-02-15" @default.
• W1915022257 modified "2023-10-10" @default.
• W1915022257 title "Survival and Tumor Localization of Adoptively Transferred Melan-A-Specific T Cells in Melanoma Patients" @default.
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• W1915022257 doi "https://doi.org/10.4049/jimmunol.170.4.2161" @default.
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