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[Cancer Research 59, 3908-3910, August 1, 1999]
© 1999 American Association for Cancer Research
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[Cancer Research 59, 3908-3910, August 15, 1999]
© 1999 American Association for Cancer Research

Advances in Brief

Cytochrome P450c17{alpha} Gene (CYP17) Polymorphism Predicts Use of Hormone Replacement Therapy1

Heather Spencer Feigelson, Roberta McKean-Cowdin, Malcolm C. Pike, Gerhard A. Coetzee, Laurence N. Kolonel, Abraham M. Y. Nomura, Loic Le Marchand and Brian E. Henderson2

Departments of Preventive Medicine [H. S. F., R. M-C., M. C. P., B. E. H.] and Urology [G. A. C.], University of Southern California School of Medicine, University of Southern California/Norris Comprehensive Cancer Center, Los Angeles, California 90033-0800, and Cancer Etiology Program, Cancer Research Center of Hawaii, University of Hawaii Honolulu, Honolulu, Hawaii 96813 [L. N. K., A. M. Y. N., L. L.]

We investigated whether a polymorphism in the cytochrome P450c17{alpha} gene (CYP17), which is associated with higher endogenous hormone levels, influences the use of hormone replacement therapy (HRT). The study included 749 postmenopausal women ages 44–75 years at baseline randomly selected from a larger multiethnic cohort. African-American, Japanese, Latina, and white women were included in the study. Women who carry the CYP17 A2/A2 genotype were about half as likely as women with the A1/A1 genotype to be current HRT users (odds ratio = 0.52; 95% confidence interval, 0.31–0.86). This association was present in all four racial/ethnic groups and for women above and below the median weight of 150 pounds. These findings suggest that the actual risk of breast cancer associated with HRT use may be higher than previously reported.




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Copyright © 1999 by the American Association for Cancer Research.