4.7 Review

The gut microbiome and efficacy of cancer immunotherapy

Journal

PHARMACOLOGY & THERAPEUTICS
Volume 231, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pharmthera.2021.107973

Keywords

Microbiota; Immunotherapy; Immune system; Immune checkpoint inhibitors

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Immunotherapy has revolutionized cancer treatment, but reliable biomarkers for predicting treatment response are still unknown. Recent studies suggest that the gut microbiota may play a role in modulating the efficacy and toxicity of immunotherapy drugs.
Cancer treatment has been deeply changed by immunotherapy, achieving unprecedented improvement in over-all and progression-free survival in several advanced and metastatic cancers. Currently, immune checkpoint in-hibitor (ICI) antibodies against cytotoxic T-lymphocyte antigen (CTLA-4) and programmed death/ligand 1 (PD-1/PD-L1) are being tested and approved for different tumors, ranging from melanoma to lung carcinoma. How-ever, only a subgroup of patients can reach treatment benefits and long-term responses, and reliable biomarkers that can accurately predict clinical responses to immunotherapy are still unidentified. In the last decade, accumulating evidence seems to suggest the gut microbiota as one of the modulators that can alter the efficacy and toxicity of immunotherapy drugs (as well as chemotherapeutics), mainly acting through the local and systemic immune system. Herein, we reviewed the highly dynamic and complex microbiome-immune system interface, its bidirectional re-lationship with cancer immunotherapies, and explored the future possibilities and risks in manipulating the gut microbiome. (c) 2021 Elsevier Inc. All rights reserved.

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