title: Beta-carotene didn't prevent cancer: what's up doc?
authors.forename: S M
authors.initials: SM
authors.lastname: Lippman
authors.forename: W K
authors.initials: WK
authors.lastname: Hong
mesh_terms: D002338:Carotenoids / Q000627:therapeutic use*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007972:Leukoplakia, Oral / Q000188:drug therapy; D009369:Neoplasms / Q000517:prevention & control*; D014212:Tretinoin / Q000627:therapeutic use; D019207:beta Carotene
chemical_list: D019207:beta Carotene; D002338:Carotenoids; D014212:Tretinoin