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- W2109663508 abstract "Abstract Adoptive immunotherapy with tumor-specific T cells has emerged as a valid approach for prevention or treatment of diseases, such as melanoma and EBV-associated lymphoma. As interleukin (IL) 15 promotes survival of CD8+ memory CTLs, we hypothesized that it could be used to enhance antitumor immunity in vivo through the maintenance of adoptively transferred memory CTL. To test this, we treated mice bearing P1A+ tumors with adoptively transferred T cells possessing a transgenic Vα8+ T-cell receptor specific for the P1A tumor antigen (called P1CTL). Mice were then randomized to receive daily low-dose IL-15 (0.5 μg/day) or PBS. Mice receiving the transgenic P1CTL and IL-15 experienced a significantly delayed tumor relapse or complete tumor regression (P < 0.002 compared with PBS), with a striking persistence of the CD8+ Vα8+ P1CTL compared with mice receiving the CD8+ Vα8+ P1CTL and PBS vehicle (26.3 versus 5.1% P < 10−5). Animals exhibiting complete tumor regression had a significant population of CD8+ Vα8+ P1CTL (46%) that persisted with IL-15 treatment until 140 days after adoptive transfer and successfully defended them against tumor rechallenge without IL-15. Low-dose IL-2 afforded no protection over vehicle and resulted in lower percentages of T cells with an activated memory phenotype, lower Bcl-2 expression, and lower ex vivo antitumor cytotoxicity compared with mice treated with IL-15. Collectively, the data support the notion that exogenous low-dose IL-15 therapy can enhance and even reverse the limited efficacy of adoptively transferred tumor-specific T-cell therapy and may do so in a fashion that is superior and distinct from exogenous IL-2 therapy." @default.
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- W2109663508 date "2004-11-01" @default.
- W2109663508 modified "2023-10-10" @default.
- W2109663508 title "Failed Adoptive Immunotherapy with Tumor-Specific T Cells" @default.
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- W2109663508 doi "https://doi.org/10.1158/0008-5472.can-04-1860" @default.
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