Abstract
Human γδ T cells are unconventional lymphocytes that function in innate and adaptive immune responses and immunosurveillance. These cells show potent cytotoxicity against tumor cells in a major histocompatibility complex unrestricted manner and have recently gained considerable attention as a sparkling star for clinical immunotherapy. Clinical immunotherapy trials with activated γδ T cells are tolerated well. However, clinical benefits are still unsatisfactory. Therefore, anti-tumor effects need to further increase the cytotoxicity of γδ T cells via several mechanisms, including the novel nitrogen-containing bisphosphonate products, adjuvant use with a bispecific antibody and chimeric antigen receptor, co-immunotherapy with γδ T cells plus immune checkpoint inhibitors, and adoptive immunotherapy with Vδ1 T cells and T cells engineered to express a defined γδ T cell receptor. Here, this article describes the crucial role of γδ T cells in anti-tumor immunity, concludes transduction strategies and summarizes the different development of novel approaches for clinical applications and cancer immunotherapy, which may be effective in overcoming current therapeutic limitations.
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