Intensity-modulated radiation therapy in head-and-neck carcinomas: Potential beyond sparing the parotid glands
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ID: 109935
2020
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Abstract
Head-and-neck cancer (HNC) is in close proximity to several critical structures. Intensity-modulated radiation therapy (IMRT) has the potential of generating highly conformal and concave dose distributions around complex target and is ideally suited for HNC treatment. Conventionally, the focus of IMRT for HNC patients has been on prevention of radiation-induced parotid dysfunction. In the present article, we review the potential of IMRT to reduce the risk of posttreatment aspiration and dysphagia and spare submandibular gland. We also discuss the impact of IMRT on overall survival and quality of life (QoL) for HNC patients. Small retrospective and prospective studies show that reducing dose to adjoining organs at risks is feasible and decreases the risk of posttreatment dysphagia and aspiration without compromising local control. IMRT is associated with improved QoL in several important domains including swallowing, dry mouth, sticky saliva, social eating, and opening of the mouth; however, improvement in global QoL is inconsistent. Delivery of IMRT for HNC is associated with improved survival at nasopharyngeal subsite. Small studies demonstrate improved treatment outcomes with swallowing-sparing IMRT. These results now need validation within the prospective multicenter randomized controlled trial setting.
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