Abstract
After reviewing its occurrence in older industries, five fatal cases and one non-fatal case of scrotal cancer, occurring in a light engineering factory from 1955-75, are described. Possible genetic factors, personal hygiene, protective clothing, prior development of keratoses on the forearms and the high ambient temperatures in a machine shop using bar automatic lathes are discussed. Results of analyses of new, used and reclaimed oils for polynuclear aromatic carcinogens in three different laboratories are given. The possibility of too-prolonged use of neat cutting oils and of conventional oil reclamation plants, leading to a dangerous accumulation of carcinogens, such as benzo{a)pyrene, is noted.
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