Abstract
Menopausal hormone therapy (HT) is associated with an increased breast cancer risk among postmenopausal women. In this study, we investigated genetic effect modification of HT associated breast cancer risk in 3,149 postmenopausal breast cancer patients and 5,489 controls from the two German population-based case–control studies MARIE and GENICA. Twenty-eight polymorphisms of 14 candidate genes including two drug and hormone transporter genes (ABCB1/MDR1 and SHBG), four genes involved in cell cycle regulation (BRCA1, P21/CDKN1A, STK15/AURKA and TP53), six cytokine genes (IGFBP3, IL6, TGFB1, TNF, LTA and IGF1), and two cytokine receptor genes (EGFR and ERBB2) were genotyped using validated methods. Conditional logistic regression was used to assess multiplicative statistical interaction between polymorphisms and duration of estrogen–progestagen therapy and estrogen monotherapy use with regard to breast cancer risk assuming log-additive and co-dominant modes of inheritance. Women homozygous for the major ABCB1_rs2214102_G allele were found to be at a significantly increased breast cancer risk associated with combined estrogen–progestagen therapy [odds ratio (OR) = 1.17, 95% confidence interval (CI) = 1.12–1.23, P interaction = 0.022]. Additionally, risk associated with estrogen monotherapy was modified by BRCA1_rs799917. We observed a trend with increasing minor T alleles leading to the highest risk in homozygous carriers of the minor allele [OR (95% CI) = 1.17 (0.98–1.39), 1.06 (0.98–1.14), and 1.02 (0.94–1.11) for homozygous minor, heterozygous, and homozygous major allele carriers, respectively; P interaction = 0.032]. Our results suggest that genetic variants in ABCB1 and BRCA1 may modify the effect of HT on postmenopausal breast cancer risk.
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Acknowledgments
We are indebted to all women participating in the MARIE and the GENICA breast cancer case–control studies. We gratefully acknowledge support by interviewers, the recruiting hospitals, and physicians of the study regions as well as their collaborating pathologists. We thank W. Höppner and colleagues from BioGlobe GmbH, Hamburg for the extensive and excellent genotyping work and S. Behrens, R. Birr, W. Busch, U. Eilber, B. Kaspereit, N. Knese, K. Smit, S. Brod, A. Seidel-Renkert, and M. Gilbert for their most valuable technical assistance. This work was funded by the Federal Ministry of Education and Research (BMBF) Germany grants 01KH0401, 01KH0402, 01KH0410, 01KH0411. The MARIE study was supported by the Deutsche Krebshilfe e.V., grant number 70-2892-BR I, the Deutsches Krebsforschungszentrum (DKFZ) and the Hamburg Cancer Society. The GENICA study was supported by the BMBF grants 01KW9975/5, 01KW9976/8, 01KW9977/0, 01KW0114, the Robert Bosch Foundation of Medical Research, Stuttgart, Department of Internal Medicine, Evangelische Kliniken Bonn gGmbH, Johanniter Krankenhaus, Bonn, Deutsches Krebsforschungszentrum (DKFZ), Heidelberg and BGFA—Research Institute of Occupational Medicine of the German Social Accident Insurance, Bochum, Germany.
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Consortium members include:
German Cancer Research Center (DKFZ), Heidelberg, Germany: Sascha Abbas, Lars Beckmann, Jenny Chang-Claude, Rebecca Hein, Silke Kropp, Margie Parthimos (Division of Cancer Epidemiology); Thomas Dünnebier, Ute Hamann (Research Group on Molecular Genetics of Breast Cancer); Benedikt Brors, Roland Eils, Marc Zapatka (Division of Theoretical Bioinformatics).
Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology (IKP), Stuttgart, and University of Tübingen, Germany: Hiltrud Brauch, Christina Justenhoven.
University Medical Center Hamburg-Eppendorf, Hamburg, Germany: Dieter Flesch-Janys (Department of Medical Biometry and Epidemiology, Center for Experimental Medicine); Wilhelm Braendle (Department of Gynecological Endocrinology and Reproductive Medicine, Center for Gynaecology, Obstetrics and Paediatrics).
BGFA—Research Institute of Occupational Medicine of the German Social Accident Insurance, Ruhr University Bochum (Bochum, Germany): Thomas Brüning, Beate Pesch, Anne Spickenheuer.
Evangelische Kliniken Bonn gGmbH, Johanniter Krankenhaus, Bonn, Germany: Christian Baisch, Yon-Dschun Ko (Department of Internal Medicine).
Congenics AG, Hamburg, Germany: Norbert Dahmen.
The Writing Group included (in alphabetical order): Sascha Abbas, Hiltrud Brauch, Jenny Chang-Claude, Thomas Dünnebier, Dieter Flesch-Janys, Ute Hamann, Rebecca Hein, Christina Justenhoven, Ramona Salazar.
Corresponding Author: Thomas Dünnebier, German Cancer Research Center (DKFZ), Molecular Genetics of Breast Cancer, Im Neuenheimer Feld 580, 69120 Heidelberg, Germany. Tel.: 0049/6221/42-4720. Fax: 0049/6221/42-4721. E-mail: t.duennebier@dkfz-heidelberg.de.
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The MARIE-GENICA Consortium on Genetic Susceptibility for Menopausal Hormone Therapy Related Breast Cancer Risk. Polymorphisms in the BRCA1 and ABCB1 genes modulate menopausal hormone therapy associated breast cancer risk in postmenopausal women. Breast Cancer Res Treat 120, 727–736 (2010). https://doi.org/10.1007/s10549-009-0489-8
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DOI: https://doi.org/10.1007/s10549-009-0489-8