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A study was conducted to test the hypothesis that oxidative DNA damage caused by exposure to organochlorines is an important risk factor in breast cancer. This is the first study that evaluates this hypothesis by measuring 8-hydroxy-2-deoxyguanosine (8-OHdG), a biomarker of oxidative DNA damage, polychlorinated biphenyl (PCB) congeners, and isomers of bis (4-chlorophenyl)-1,1,1-trichloroethane (DDT)...