“…Reviews of these studies are contin ua lly carried o ut by the Internationa l Age ncy for Resea rch on Cancer (IA RC), who se recent publications ha ve been focused on the products derived from coal (6)(7)(8) . Indeed the industrial processes which use coa l and its byproducts generate diverse polycycl ic aromatic hyd rocarbons (P A H), whose carcino geno us po tential is suspec ted (2,6,(9)(10)(11)(12). Th is po llutio n is often o bserved in factories where coal is gasified , in co keworks, in iron a nd stee l fou ndries, and in coal-ta r disti llerie s, as well as in other plan ts which use coa l by-products (2,7,8).…”