Igniting Hope for Tumor Immunotherapy: Promoting the “Hot and Cold” Tumor Transition

The discovery of immune checkpoint inhibitors (ICIs) has ushered a new era for immunotherapy against malignant tumors through the killing effects of cytotoxic T lymphocytes in the tumor microenvironment (TME), resulting in long-lasting tumor suppression and regression. Nevertheless, given that ICIs...

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Published in:Clinical Medicine Insights. Oncology 2022, Vol.16, p.11795549221120708
Main Authors: Wei, Chen, Ma, Yichao, Wang, Fei, Liao, Yiqun, Chen, Yuji, Zhao, Bin, Zhao, Qi, Wang, Daorong, Tang, Dong
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Language:English
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Cold
Immunotherapy
Role of Stroma and Tumor Microenvironment on Growth and Sensitivity of Tumor Cells to Therapy
Tumors
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description The discovery of immune checkpoint inhibitors (ICIs) has ushered a new era for immunotherapy against malignant tumors through the killing effects of cytotoxic T lymphocytes in the tumor microenvironment (TME), resulting in long-lasting tumor suppression and regression. Nevertheless, given that ICIs are highly dependent on T cells in the TME and that most tumors lack T-cell infiltration, promoting the conversion of such immunosuppressive “cold” tumors to “hot” tumors is currently a key challenge in tumor immunotherapy. Herein, we systematically outlined the mechanisms underlying the formation of the immunosuppressive TME in cold tumors, including the role of immunosuppressive cells, impaired antigen presentation, transforming growth factor-β, STAT3 signaling, adenosine, and interferon-γ signaling. Moreover, therapeutic strategies for promoting cold tumors to hot tumors with adequate T-cell infiltration were also discussed. Finally, the prospects of therapeutic tools such as oncolytic viruses, nanoparticles, and photothermal therapy in restoring immune activity in cold tumors were thoroughly reviewed.
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subjects Cold
Immunotherapy
Role of Stroma and Tumor Microenvironment on Growth and Sensitivity of Tumor Cells to Therapy
Tumors
title Igniting Hope for Tumor Immunotherapy: Promoting the “Hot and Cold” Tumor Transition
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