Chemical Carcinogenesis

THE perception of cancer as a disease primarily related to the environment has been progressively strengthened since the publication of a Medical Progress article on chemical carcinogenesis in 1971.1 By the mid-1960s, the view of the cause and pathogenesis of cancer had already begun to change radically from that of previous decades, during which no clear perception of the possible role of the environment in the genesis of most of the major forms of cancer was evident. Although the relation of cancer to environmental hazards in the work place and to a few unusual cultural patterns around the world was . . .