title: Vitamin A, tumor initiation and tumor promotion.
mesh_terms: D000818:Animals; D006224:Cricetinae; D008113:Liver Neoplasms / Q000517:prevention & control; D008175:Lung Neoplasms / Q000517:prevention & control; D051379:Mice; D009369:Neoplasms / Q000517:prevention & control*; D051381:Rats; D012878:Skin Neoplasms / Q000517:prevention & control; D014212:Tretinoin / Q000378:metabolism / Q000502:physiology; D014801:Vitamin A / Q000502:physiology*
chemical_list: D014801:Vitamin A; D014212:Tretinoin