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Dose Patterns of Cellular Effects Induced by Carcinogens: Evidence for the Presence or Absence of ThresholdsThe George Washington University School of Medicine and Health Sciences
The George Washington University School of Medicine and Health Sciences The patterns of response of individual cells to carcinogens may be a factor that influences the shape of the dose-response curve for cancer in human populations; thus the existence of a threshold for cellular response may imply a threshold for cancer induction. The patterns of response of cultured mammalian cells to carcinogen treatment is described for four cellular endpoints: cytotoxidty, mutation, sister chromatid exchange, and in vitro transformation. These data, taken in toto, indicate that for some carcinogens a threshold exists for the induction of cellular effects, but for some carcinogens thresholds probably do not exist. Cancer-prone human beings may contain cell populations without thresholds, making them especially sensitive to low doses of environmental carcinogens.
International Journal of Toxicology, Vol. 2, No. 3,
185-193 (1983) |
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