title: Retinoid chemoprevention trial begins against bladder cancer.
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D006801:Humans; D051381:Rats; D012306:Risk; D013997:Time Factors; D014212:Tretinoin / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*; D001749:Urinary Bladder Neoplasms / Q000517:prevention & control*; D014801:Vitamin A / Q000031:analogs & derivatives*
chemical_list: D014801:Vitamin A; D014212:Tretinoin