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A genome-wide association study of breast cancer in women of African ancestry

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Abstract

Genome-wide association studies (GWAS) in diverse populations are needed to reveal variants that are more common and/or limited to defined populations. We conducted a GWAS of breast cancer in women of African ancestry, with genotyping of >1,000,000 SNPs in 3,153 African American cases and 2,831 controls, and replication testing of the top 66 associations in an additional 3,607 breast cancer cases and 11,330 controls of African ancestry. Two of the 66 SNPs replicated (p < 0.05) in stage 2, which reached statistical significance levels of 10−6 and 10−5 in the stage 1 and 2 combined analysis (rs4322600 at chromosome 14q31: OR = 1.18, p = 4.3 × 10−6; rs10510333 at chromosome 3p26: OR = 1.15, p = 1.5 × 10−5). These suggestive risk loci have not been identified in previous GWAS in other populations and will need to be examined in additional samples. Identification of novel risk variants for breast cancer in women of African ancestry will demand testing of a substantially larger set of markers from stage 1 in a larger replication sample.

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Acknowledgments

This work was supported by a Department of Defense Breast Cancer Research Program Era of Hope Scholar Award to CAH [W81XWH-08-1-0383] and the Norris Foundation. Each of the participating studies was supported by the following grants: MEC (National Institutes of Health grants R01-CA63464 and R37-CA54281); CARE (National Institute for Child Health and Development grant NO1-HD-3-3175); WCHS (U.S. Army Medical Research and Material Command (USAMRMC) grant DAMD-17-01-0-0334, the National Institutes of Health grant R01-CA100598, and the Breast Cancer Research Foundation); SFBCS (National Institutes of Health grant R01-CA77305 and United States Army Medical Research Program grant DAMD17-96-6071); NC-BCFR (National Institutes of Health grant U01-CA69417); CBCS (National Institutes of Health Specialized Program of Research Excellence in Breast Cancer, grant number P50-CA58223, and Center for Environmental Health and Susceptibility National Institute of Environmental Health Sciences, National Institutes of Health, grant number P30-ES10126); PLCO (Intramural Research Program, National Cancer Institute, National Institutes of Health); NBHS (National Institutes of Health grant R01-CA100374); SCCS (National Institutes of Health grant R01-CA092447), WFBC (National Institutes of Health grant R01-CA73629); BWHS (National Institutes of Health grants R01-CA58420 and R01-CA98663) and WISE (National Institutes of Health grant P01-CA77596). OI Olopade and D Huo were supported by National Institutes of Health Specialized Program of Research Excellence in Breast Cancer, grant number P50-CA125183 and National Cancer Institute R01-CA141712. BBCS is supported by the Intramural Research Program of the NIH, National Cancer Institute, Center for Cancer Research. The Breast Cancer Family Registry (BCFR) was supported by the National Cancer Institute, National Institutes of Health under RFA-CA-06-503 and through cooperative agreements with members of the Breast Cancer Family Registry and Principal Investigators. The content of this manuscript does not necessarily reflect the views or policies of the National Cancer Institute or any of the collaborating centers in the BCFR, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government or the BCFR. The WHI program is funded by the National Heart, Lung, and Blood Institute, National Institute of Health, U.S. Department of Health and Human Services through contracts N01WH22110, 24152, 32100-2, 32105-6, 32108-9, 32111-13, 32115, 32118-32119,32122, 42107-26, 42129-32, and 44221. Funding for WHI SHARe genotyping was provided by NHLBI Contract N02-HL-64278. We thank the women who volunteered to participate in each study. We also thank Madhavi Eranti, Andrea Holbrook, Paul Poznaik, David Wong and Lucy Xia from the University of Southern California for their technical support. We would also like to acknowledge co-investigators from the WCHS study: Dana H. Bovbjerg (University of Pittsburgh), Lina Jandorf (Mount Sinai School of Medicine) and Gregory Ciupak, Warren Davis, Gary Zirpoli, Song Yao and Michelle Roberts from Roswell Park Cancer Institute.

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The authors declare that they have no conflict of interest.

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The experiments done in this manuscript comply with the current laws of the country of USA.

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Correspondence to Christopher A. Haiman.

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F. Chen and G. K. Chen contribued equally to this work.

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Chen, F., Chen, G.K., Stram, D.O. et al. A genome-wide association study of breast cancer in women of African ancestry. Hum Genet 132, 39–48 (2013). https://doi.org/10.1007/s00439-012-1214-y

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