Tamoxifen, a breast cancer drug, has recently been approved for the chemoprevention of this disease. However, tamoxifen causes hepatic carcinomas in rats through a genotoxic mechanism and increases the risk of endometrial tumors in women. DNA adducts have been detected at low levels in human endometrium, and there is much interest in determining whether DNA damage plays a role in tamoxifen-induced endometrial carcinogenesis.
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