Journal
CANCER CELL INTERNATIONAL
Volume 21, Issue 1, Pages -Publisher
BMC
DOI: 10.1186/s12935-021-01972-2
Keywords
Tumor microenvironment; Oncolytic virus; Immunotherapy; Combination therapy
Categories
Funding
- National Natural Science Foundation of China [81622049, 81871989]
- Shanghai Science and Technology Committee Program [19XD1420900]
- Shanghai Education Commission Program [17SG04]
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Oncolytic viruses (OVs) are emerging as a promising therapeutic agent to overcome the immunosuppressive tumor microenvironment (TME) and enhance the efficacy of immunotherapy. Strategies involving OVs include serving as a cancer vaccine, expressing proinflammatory factors and immune checkpoint inhibitors, and regulating nonimmune stromal constituents. Optimization of preclinical models and achieving systemic delivery of OVs are crucial for the successful clinical translation in the future.
It has been intensively reported that the immunosuppressive tumor microenvironment (TME) results in tumor resistance to immunotherapy, especially immune checkpoint blockade and chimeric T cell antigen therapy. As an emerging therapeutic agent, oncolytic viruses (OVs) can specifically kill malignant cells and modify immune and non-immune TME components through their intrinsic properties or genetically incorporated with TME regulators. Strategies of manipulating OVs against the immunosuppressive TME include serving as a cancer vaccine, expressing proinflammatory factors and immune checkpoint inhibitors, and regulating nonimmune stromal constituents. In this review, we summarized the mechanisms and applications of OVs against the immunosuppressive TME, and strategies of OVs in combination with immunotherapy. We also introduced future directions to achieve efficient clinical translation including optimization of preclinical models that simulate the human TME and achieving systemic delivery of OVs.
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