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We conducted a nested case control study of 178 incident breast cancer cases and 356 controls in the Atherosclerosis Risk in Communities study. We evaluated the association between breast cancer and Val432Leu polymorphism in the CYP1B1 gene and the tetranucleotide repeats in intron 4 of the CYP19 gene. After adjustment for height, age at menopause, age at menarche, BMI, HRT, and alcohol intake, carriers...
The effects of a series of non-ortho-substituted polychlorinated biphenyls (PCBs) on human cytochrome P450 1A1 (CYP1A1), a 17β-estradiol (E 2 ) 2-hydroxylase, and P450 1B1 (CYP1B1), an E 2 4-hydroxylase, were investigated in HepG2 and MCF-7 cells. Elevated rates of 2- and 4-methoxyestradiol (2- and 4-MeOE 2 ) formation in PCB-treated cultures were measured as activities of...
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