Abstract
The field of cancer therapy has been revolutionized through the use of immunotherapy, and treatment with these therapies now spans from early to late stage, and even into prevention. However, there are still a significant proportion of patients who do not derive long-term benefit from monotherapy and even combined therapy regimens, and novel approaches are needed to enhance therapeutic responses. Additionally, ideal biomarkers of response to immunotherapy are lacking and are critically needed. An emerging area of interest in immuno-oncology (IO) is the microbiome, which refers to the collection of microbes (and their genomes) that inhabit an individual and live in symbiosis. There is now evidence that these microbes (particularly those within the gut) impact host physiology and can impact responses to immunotherapy. The field of microbiome research in immuno-oncology is quickly emerging, with the potential use of the microbiome (in the gut as well as in the tumor) as a biomarker for response to IO as well as a therapeutic target. Notably, the microbiome may even have a role in toxicity to therapy. The state of the science in microbiome and IO are discussed and caveats and future directions are outlined to provide insights as we move forward as a field.
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Acknowledgments
J.A.W. is supported by the NIH (1 R01 CA219896-01A1), U.S Israel Binational Science Foundation (201332), the Melanoma Research Alliance (4022024), American Association for Cancer Research Stand Up To Cancer (SU2C-AACR-IRG-19-17), Department of Defense (W81XWH-16-1-0121), MD Anderson Cancer Center Multidisciplinary Research Program Grant, Andrew Sabin Family Fellows Program, and MD Anderson Cancer Center’s Melanoma Moon Shots Program. J.A.W. is a member of the Parker Institute for Cancer Immunotherapy at MD Anderson Cancer Center. Figures were prepared using Biorender.com.
Conflict of Interest
J. Wargo is an inventor on a US patent application (PCT/US17/53.717) submitted by the University of Texas MD Anderson Cancer Center that covers methods to enhance immune checkpoint blockade responses by modulating the microbiome. He reports compensation for speaker’s bureau and honoraria from Imedex, Dava Oncology, Omniprex, Illumina, Gilead, PeerView, Physician Education Resource, MedImmune, and Bristol-Myers Squibb. He serves as a consultant/advisory board member for Roche/Genentech, Novartis, AstraZeneca, GlaxoSmithKline, Bristol-Myers Squibb, Merck, Biothera Pharmaceuticals, and Microbiome DX. J. Wargo also receives research support from GlaxoSmithKline, Roche/Genentech, Bristol-Myers Squibb, and Novartis.
The other authors declared no conflict of interest.
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Toker, J., Arora, R., Wargo, J.A. (2020). The Microbiome in Immuno-oncology. In: Naing, A., Hajjar, J. (eds) Immunotherapy. Advances in Experimental Medicine and Biology, vol 1244. Springer, Cham. https://doi.org/10.1007/978-3-030-41008-7_19
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