About two centuries after the communication by Sir Percival Pott
that the "chimney sweeper disease" was a cancer and its suggestion
that active compounds of soot were the causative agents, and about
one century after the description of urinary bladder cancer in dye
workers, an enormous number of substances have been synthesized and
have probably come into contact with man. Research in cancer
prevention is of primary importance, and may receive continuous
support from new discoveries on cancer etiology and pathogenesis.
If one accepts the multistage model of chemical carcinogenesis, one
has also to accept that many events occur between the contact of
carcino genic compounds and their specific targets and the
development of a clinically recognizable neoplasm. Thus, animal
studies become essential to elucidate the different steps by which
chemical carcinogens induce neoplasia. The analysis of these steps
and the comparative evaluation of experimental models is essential
to an understanding of pathogenesis."
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