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    Breast Cancer Res. 2005;7(6):R890-6. Epub 2005 Sep 14.

    CYP17 gene polymorphism in relation to breast cancer risk: a case-control study.

    Einarsdóttir K, Rylander-Rudqvist T, Humphreys K, Ahlberg S, Jonasdottir G, Weiderpass E, Chia KS, Ingelman-Sundberg M, Persson I, Liu J, Hall P, Wedrén S.

    Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden. Kristjana.Einarsdottir@meb.ki.se

    INTRODUCTION: The c.1-34T>C 5' promoter region polymorphism in cytochrome P450c17 (CYP17), a key enzyme in the biosynthesis of estrogen, has been associated with breast cancer risk, but most previous studies have been relatively small. METHODS: We genotyped 1,544 incident cases of primary breast cancer and 1,502 population controls, all postmenopausal Swedish women, for the CYP17 c.1-34T>C polymorphism and calculated odds ratios (ORs) and 95% confidence intervals (CIs) from logistic regression models. RESULTS: No overall association was found between CYP17 c.1-34T>C and breast cancer risk, OR 1.0 (95% CI 0.8-1.3) for the A2/A2 (CC) carriers compared to the A1/A1 (TT) carriers, regardless of histopathology. We detected an interaction between CYP17 c.1-34T>C and age at menarche (P = 0.026) but regarded that as a chance finding as no dose-response pattern was evident. Other breast cancer risk factors, including menopausal hormone use and diabetes mellitus, did not modify the overall results. CONCLUSION: It is unlikely that CYP17 c.1-34T>C has a role in breast cancer etiology, overall or in combination with established non-genetic breast cancer risk factors.

    PMID: 16280037 [PubMed - indexed for MEDLINE]

    PMCID: PMC1410739

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