In situ vaccination with defined factors overcomes T cell exhaustion in distant tumors

Irreversible T cell exhaustion limits the efficacy of programmed cell death 1 (PD-1) blockade. We observed that dual CD40-TLR4 stimulation within a single tumor restored PD-1 sensitivity and that this regimen triggered a systemic tumor-specific CD8+ T cell response. This approach effectively treated established tumors in diverse syngeneic cancer models, and the systemic effect was dependent on the injected tumor, indicating that treated tumors were converted into necessary components of this therapy. Strikingly, this approach was associated with the absence of exhausted PD-1hi T cells in treated and distant tumors, while sparing the intervening draining lymph node and spleen. Furthermore, patients with transcription changes like those induced by this therapy experienced improved progression-free survival with anti–PD-1 treatment. Dual CD40-TLR4 activation within a single tumor is thus an approach for overcoming resistance to PD-1 blockade that is unique in its ability to cause the loss of exhausted T cells within tumors while sparing nonmalignant tissues.
Source: Journal of Clinical Investigation - Category: Biomedical Science Authors: Source Type: research

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Source: Nature Reviews Clinical Oncology - Category: Cancer & Oncology Authors: Source Type: research
Publication date: October 2020Source: The Lancet Global Health, Volume 8, Issue 10Author(s): Zhuoru Zou, Christopher K Fairley, Jason J Ong, Jane Hocking, Karen Canfell, Xiaomeng Ma, Eric P F Chow, Xianglong Xu, Lei Zhang, Guihua Zhuang
Source: The Lancet Global Health - Category: International Medicine & Public Health Source Type: research
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Source: ScienceNOW - Category: Science Authors: Tags: Immunology, Online Only review Source Type: news
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Source: Videocast - All Events - Category: General Medicine Tags: Upcoming Events Source Type: video
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Source: Cancer Immunology, Immunotherapy - Category: Cancer & Oncology Source Type: research
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Source: Mol Biol Cell - Category: Molecular Biology Authors: Tags: Methods Mol Biol Source Type: research
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Source: Mol Biol Cell - Category: Molecular Biology Authors: Tags: Methods Mol Biol Source Type: research
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Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
ACS Applied Materials&InterfacesDOI: 10.1021/acsami.0c15057
Source: ACS Applied Materials and Interfaces - Category: Materials Science Authors: Source Type: research
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