title: Evaluating vitamin prophylaxis for cancer.
mesh_terms: D002338:Carotenoids / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D006801:Humans; D009369:Neoplasms / Q000517:prevention & control*; D014815:Vitamins / Q000627:therapeutic use*; D019207:beta Carotene
chemical_list: D014815:Vitamins; D019207:beta Carotene; D002338:Carotenoids