No threshold approach in the risk assessment of genotoxic carcinogen. Is it still well supported by current knowledge of carcinogenesis?

No threshold approach is routinely applied in the risk assessment of genotoxic carcinogens. How this approach is supported by data? Isn´ t it somewhat obsolete?

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Leslie Recio
Absolutely not; all genotoxic carcinogens show nonlinear dose response curves based on current studies. The difference between theory and having actual data.
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Dr.Roaa
The no threshold approach is applied 
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Angelo Moretto
It is not; it has never been