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This editorial discusses the distribution of carcinogens in the human environment and stresses the idea that both the accumulation processes and the breakdown of carcinogens can coexist in humans. Therefore, prevention of tumors depends on comprehensive studies of the carcinogenic action of some chemicals and on information not only on the transmission of these compounds in the human environment but also on their metabolism within the body.

Circulation of Carcinogenic Polycyclic Aromatic Hydrocarbons in the Human Environment and Cancer Prevention