title: Tar, ultraviolet light, PUVA, and cancer.
mesh_terms: D003033:Coal Tar / Q000009:adverse effects*; D003043:Cocarcinogenesis; D006801:Humans; D011701:PUVA Therapy / Q000009:adverse effects*; D010778:Photochemotherapy / Q000009:adverse effects*; D011230:Precancerous Conditions / Q000209:etiology; D011565:Psoriasis / Q000188:drug therapy; D012878:Skin Neoplasms / Q000209:etiology*; D014467:Ultraviolet Therapy / Q000009:adverse effects*
chemical_list: D003033:Coal Tar