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Radiotherapy plans were retrospectively analyzed to assess dose delivered to DARS. The association between swallowing outcomes and participant demographics, tumor characteristics, and radiotherapy dose in definitive and postoperative treatment cohorts was assessed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Ninety\u2010three participants who received radiotherapy for HNC were included in the analysis (<jats:italic>n<\/jats:italic>\u00a0=\u00a049 definitive radiotherapy for laryngeal\/pharyngeal primary tumors and <jats:italic>n<\/jats:italic>\u00a0=\u00a044 postoperative PORT for predominantly oral cavity\/salivary gland tumors). Participants undergoing PORT had lower doses to DARS than those undergoing definitive RT. High dose to the pharyngeal constrictors and base of tongue for definitive RT and the esophageal inlet, supraglottic larynx and cervical esophagus for the PORT group were associated with worse swallowing function.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Radiation dose to DARS is associated with post\u2010treatment swallowing outcomes. These dose\/outcome relationships may vary between the definitive and postoperative settings.<\/jats:p><\/jats:sec>","DOI":"10.1002\/hed.26936","type":"journal-article","created":{"date-parts":[[2021,11,22]],"date-time":"2021-11-22T20:19:31Z","timestamp":1637612371000},"page":"399-411","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Functional swallowing outcomes related to radiation exposure to dysphagia and aspiration\u2010related structures in patients with head and neck cancer undergoing definitive and postoperative intensity\u2010modulated radiotherapy"],"prefix":"10.1002","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8246-210X","authenticated-orcid":false,"given":"Emma","family":"Charters","sequence":"first","affiliation":[{"name":"Department of Allied Health, Speech Pathology Chris O'Brien Lifehouse  Sydney New South Wales 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