Opinion statement
The role of targeted therapy is firmly established for gastrointestinal stromal tumors (GISTs); other modalities for targeting this disease are necessary for recurrent and refractory disease. There are several lines of evidence pointing to an active role of the immune system in GIST. Preclinical and clinical studies revealed that the most common type of immune cell infiltration in GISTs is tumor-associated macrophages (TAMs). The mechanism of how TAMs sculpt the tumor microenvironment in GIST is not clear, but it seems that the presence of immunosuppressive regulatory T cells (Tregs) is correlated with the number of TAMs, thus linking macrophages to immunosuppression. CD3+ T cells and NK infiltrates are found in the GIST microenvironment and carry some prognostic value. In early clinical trials, there is evidence for an active role for immunotherapy in treating GIST patients. Moreover, preclinical evidence has indicated that combining TKIs with checkpoint blockers may be synergistic in murine GIST models. Overall, there is substantial preclinical and clinical evidence to support a role for immunoregulation in GIST and further studies will be important for the development of immunotherapies for GIST.
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Jomjit Chantharasamee declares that he has no conflict of interest. Jacob J. Adashek declares that he has no conflict of interest. Karlton Wong declares that he has no conflict of interest. Mark A. Eckardt declares that he has no conflict of interest. Bartosz Chmielowski has received compensation for service on advisory boards from IDEAYA Biosciences, Biothera, Epizyme, Deciphera, Iovance Biotherapeutics, Sanofi Genzyme, Regeneron, Eli Lilly, HUYA Bioscience International, Compugen, Array BioPharma, and Merck and has received compensation for service on speakers’ bureaus from Sanofi Genzyme, Regeneron, Janssen, and Genentech. Sarah Dry declares that she has no conflict of interest. Fritz C. Eilber has served on a scientific advisory board for Certis Oncology Solutions. Arun S. Singh has received research support from Bristol-Myers Squibb (grant and provided drug for trial), Eli Lilly, Daiichi Sankyo, Deciphera, NanoCarrier, Eisai, and Blueprint Medicines; has received compensation from Bristol-Myers Squibb, Eli Lilly, Novartis, Daiichi Sankyo, Deciphera, Expert Perspectives, OncLive, Roche, and Blueprint Medicines; and serves on the board of directors and owns stock in Certis Oncology Solutions.
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Chantharasamee, J., Adashek, J.J., Wong, K. et al. Translating Knowledge About the Immune Microenvironment of Gastrointestinal Stromal Tumors into Effective Clinical Strategies. Curr. Treat. Options in Oncol. 22, 9 (2021). https://doi.org/10.1007/s11864-020-00806-z
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DOI: https://doi.org/10.1007/s11864-020-00806-z