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Multistage carcinogenesis and the incidence of human cancer.
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Abstract
We consider the implications of multistage carcinogenesis for the incidence of cancer in human populations. When clonal expansion of partially altered cells is properly accounted for, we find it unnecessary to invoke genomic instability as an early event in malignant transformation. Environmental agents that increase the rate of clonal expansion of partially altered cells are efficient carcinogens. As a corollary, intervention strategies that decrease this rate are to be preferred to strategies that decrease the rate of early mutational events in carcinogenesis.