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Prevention and treatment of radiotherapy‐induced side effects
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Prevention and treatment of radiotherapy‐induced side effects
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Journal Article
Prevention and treatment of radiotherapy‐induced side effects
2020
Overview
Radiotherapy remains a mainstay of cancer treatment, being used in roughly 50% of patients. The precision with which the radiation dose can be delivered is rapidly improving. This precision allows the more accurate targeting of radiation dose to the tumor and reduces the amount of surrounding normal tissue exposed. Although this often reduces the unwanted side effects of radiotherapy, we still need to further improve patients’ quality of life and to escalate radiation doses to tumors when necessary. High‐precision radiotherapy forces one to choose which organ or functional organ substructures should be spared. To be able to make such choices, we urgently need to better understand the molecular and physiological mechanisms of normal tissue responses to radiotherapy. Currently, oversimplified approaches using constraints on mean doses, and irradiated volumes of normal tissues are used to plan treatments with minimized risk of radiation side effects. In this review, we discuss the responses of three different normal tissues to radiotherapy: the salivary glands, cardiopulmonary system, and brain. We show that although they may share very similar local cellular processes, they respond very differently through organ‐specific, nonlocal mechanisms. We also discuss how a better knowledge of these mechanisms can be used to treat or to prevent the effects of radiotherapy on normal tissue and to optimize radiotherapy delivery. Here, we discuss the complexity of radiotherapy‐induced side effects and approaches for prevention or treatment. Radiation damage develops at a cellular level, progresses to intercellular interactions resulting in intra‐ and interorgan functional responses. These need different approaches for prevention or treatment, for instance intracellular signaling modification, sparing of specific stem cell‐containing areas or contributing organs, and stem cell therapies.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
