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Long-term carcinogenicity studies are conducted to evaluate the carcinogenic risk of xenobiotics by comparing the incidences of neoplastic and pre-neoplastic lesions in laboratory animals observed in the dose groups with those in the concurrent control.

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1.Studies showed that xenobiotics could induce bladder cancer,but its mechanism was still not so clear.
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2.Xenobiotics metabolism enzymes include Phase¢ñenzymes such as Cytochromes P450(CYP450) and Phase ¢òenzymes such as Glutathione S-Transferase (GSTs) and N-acetyltransferase (NATs).
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3.It is thought that extracellular GSH protects the cells from oxidants released by inflammatory cells whilst intracellular GSH neutralizes the ROS produced as a result of normal cell metabolism, as well as detoxifying xenobiotics(4).
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