title: Role of opium in esophageal cancer: a hypothesis.
mesh_terms: D000328:Adult; D004938:Esophageal Neoplasms / Q000209:etiology*; D005769:Gastrointestinal Motility / Q000187:drug effects; D006801:Humans; D009892:Opium; D019966:Substance-Related Disorders / Q000150:complications
chemical_list: D009892:Opium