alexa Myeloid-derived cells in tumors: effects of radiation.


Immunotherapy: Open Access

Author(s): Vatner RE, Formenti SC, Vatner RE, Formenti SC, Vatner RE, Formenti SC, Vatner RE, Formenti SC

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Abstract The discrepancy between the in vitro and in vivo response to radiation is readily explained by the fact that tumors do not exist independently of the host organism; cancer cells grow in the context of a complex microenvironment composed of stromal cells, vasculature, and elements of the immune system. As the antitumor effect of radiotherapy depends in part on the immune system, and myeloid-derived cells in the tumor microenvironment modulate the immune response to tumors, it follows that understanding the effect of radiation on myeloid cells in the tumor is likely to be essential for comprehending the antitumor effects of radiotherapy. In this review, we describe the phenotype and function of these myeloid-derived cells, and stress the complexity of studying this important cell compartment owing to its intrinsic plasticity. With regard to the response to radiation of myeloid cells in the tumor, evidence has emerged demonstrating that it is both model and dose dependent. Deciphering the effects of myeloid-derived cells in tumors, particularly in irradiated tumors, is key for attempting to pharmacologically modulate their actions in the clinic as part of cancer therapy. Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved. This article was published in Semin Radiat Oncol and referenced in Immunotherapy: Open Access

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