title: Thresholds in cancer induction. If they exist, do they shift?
mesh_terms: D001580:Benzopyrenes; D002273:Carcinogens / Q000008:administration & dosage; D004357:Drug Synergism; D004782:Environmental Health; D008452:Maximum Allowable Concentration; D008954:Models, Biological; D009369:Neoplasms / Q000209:etiology*
chemical_list: D001580:Benzopyrenes; D002273:Carcinogens