[Precancerous changes in esophageal cancer].
D000818:Animals; D004938:Esophageal Neoplasms / Q000188:drug therapy / Q000473:pathology*; D004947:Esophagus / Q000473:pathology; D006801:Humans; D006965:Hyperplasia; D051379:Mice; D011230:Precancerous Conditions / Q000473:pathology*; D014801:Vitamin A / Q000494:pharmacology
D014801:Vitamin A