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Laryngopharyngeal reflux refers to the retrograde flow of gastric contents into the larynx, oropharynx, and\/or nasopharynx. It remains controversial whether laryngopharyngeal reflux is a risk factor for laryngeal and hypopharyngeal cancers. The refluxing substances mainly include hydrochloric acid, pepsin, and occasionally bile acids and bile salts, as well as bacteria that colonize the gastrointestinal tract. Loss of epithelium in the mucous membrane of the larynx and hypopharynx is thought to be caused by pepsin. Here, we review the relationships between laryngopharyngeal reflux and both laryngeal and hypopharyngeal carcinomas, as well as the significance of pepsin, methods of clinical detection, and the mechanism of carcinogenesis.<\/jats:p>","DOI":"10.21053\/ceo.2020.00465","type":"journal-article","created":{"date-parts":[[2020,7,24]],"date-time":"2020-07-24T01:00:22Z","timestamp":1595552422000},"page":"159-168","update-policy":"https:\/\/doi.org\/10.21053\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Pepsin and Laryngeal and Hypopharyngeal 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