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- W2068763039 abstract "Abstract There is no effective treatment for prostate cancer arising after androgen ablation. Previous studies have analyzed the short-term effects of androgen ablation on the immune system and suggest an abatement of immune suppression by hormone removal. Because castration-resistant disease can arise years after treatment, it is crucial to determine the duration of immune potentiation by castration. Because immunotherapeutic efficacy is determined by the balance of immune cell subsets and their location within the tumor, we assessed the acute and chronic effect of androgen ablation on the localization of T-cell subsets within castration-resistant murine prostate cancer. We observed a transient increase in CD4+ and CD8+ T-cell numbers at the residual tumor after androgen ablation. More than 2 months later, regulatory T cells (Treg) were increasingly found within prostate epithelium, whereas CTLs, which were evenly distributed before androgen ablation, became sequestered within stroma. Anti-CD25 antibody administration along with castration enhanced CTL access to cancerous glands but did not increase effector function. Intraprostatic injection of LIGHT-expressing tumor cells increased the proportion of CD8+ T cells with functional capacity within the cancerous gland. In addition, Treg depletion within the tumor was enhanced. Together, these manipulations significantly reduced castration-resistant tumor burden. Thus, our results indicate that immune modulations, which prevent Treg accumulation and augment effector cell infiltration of prostatic epithelium, may be effective in reducing tumor burden or preventing tumor recurrence after androgen ablation therapy. Cancer Res; 70(9); 3473–82. ©2010 AACR." @default.
- W2068763039 created "2016-06-24" @default.
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- W2068763039 date "2010-04-28" @default.
- W2068763039 modified "2023-10-05" @default.
- W2068763039 title "<i>In situ</i> Vaccination Combined with Androgen Ablation and Regulatory T-Cell Depletion Reduces Castration-Resistant Tumor Burden in Prostate-Specific <i>Pten</i> Knockout Mice" @default.
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- W2068763039 doi "https://doi.org/10.1158/0008-5472.can-09-2490" @default.
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