We conducted a meta-analysis of three endometrial cancer genome-wide association studies (GWAS) and two follow-up phases totaling 7,737 endometrial cancer cases and 37,144 controls of European ancestry. Genome-wide imputation and meta-analysis identified five new risk loci of genome-wide significance at likely regulatory regions on chromosomes 13q22.1 (rs11841589, near KLF5), 6q22.31 (rs13328298, in LOC643623 and near HEY2 and NCOA7), 8q24.21 (rs4733613, telomeric to MYC), 15q15.1 (rs937213, in EIF2AK4, near BMF) and 14q32.33 (rs2498796, in AKT1, near SIVA1). We also found a second independent 8q24.21 signal (rs17232730). Functional studies of the 13q22.1 locus showed that rs9600103 (pairwise r2 = 0.98 with rs11841589) is located in a region of active chromatin that interacts with the KLF5 promoter region. The rs9600103[T] allele that is protective in endometrial cancer suppressed gene expression in vitro, suggesting that regulation of the expression of KLF5, a gene linked to uterine development, is implicated in tumorigenesis. These findings provide enhanced insight into the genetic and biological basis of endometrial cancer.
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We thank the many individuals who participated in this study and the numerous institutions and their staff that supported recruitment, detailed in full in the Supplementary Note.
The iCOGS endometrial cancer analysis was supported by an NHMRC project grant (1031333) to A.B.S., D.F.E. and A.M.D. A.B.S., P.M.W., G.W.M. and D.R.N. are supported by the NHMRC Fellowship scheme. A.M.D. was supported by the Joseph Mitchell Trust. I.T. is supported by Cancer Research UK and the Oxford Comprehensive Biomedical Research Centre. T.H.T.C. is supported by the Rhodes Trust and the Nuffield Department of Medicine. Funding for iCOGS infrastructure came from the European Community's Seventh Framework Programme under grant agreement 223175 (HEALTH-F2-2009-223175) (COGS), Cancer Research UK (C1287/A10118, C1287/A10710, C12292/A11174, C1281/A12014, C5047/A8384, C5047/A15007, C5047/A10692 and C8197/A16565), the US National Institutes of Health (R01 CA128978, U19 CA148537, U19 CA148065 and U19 CA148112), the US Department of Defense (W81XWH-10-1-0341), the Canadian Institutes of Health Research (CIHR) for the CIHR Team in Familial Risks of Breast Cancer, the Susan G. Komen Foundation for the Cure, the Breast Cancer Research Foundation and the Ovarian Cancer Research Fund.
ANECS recruitment was supported by project grants from the NHMRC (339435), Cancer Council Queensland (4196615) and Cancer Council Tasmania (403031 and 457636). SEARCH recruitment was funded by a programme grant from Cancer Research UK (C490/A10124). Stage 1 and stage 2 case genotyping was supported by the NHMRC (552402 and 1031333). Control data were generated by the WTCCC, and a full list of the investigators who contributed to the generation of the data is available from the WTCCC website. We acknowledge use of DNA from the British 1958 Birth Cohort collection, funded by UK Medical Research Council grant G0000934 and Wellcome Trust grant 068545/Z/02; funding for this project was provided by the Wellcome Trust under award 085475. NSECG was supported by the European Union's Framework Programme 7 CHIBCHA grant and Wellcome Trust Centre for Human Genetics Core Grant 090532/Z/09Z, and CORGI was funded by Cancer Research UK. Recruitment of the QIMR Berghofer controls was supported by the NHMRC. The University of Newcastle, the Gladys M. Brawn Senior Research Fellowship scheme, the Vincent Fairfax Family Foundation, the Hunter Medical Research Institute and the Hunter Area Pathology Service all contributed toward the costs of establishing HCS.
The Bavarian Endometrial Cancer Study (BECS) was partly funded by the ELAN fund of the University of Erlangen. The Hannover–Jena Endometrial Cancer Study was partly supported by the Rudolf Bartling Foundation. The Leuven Endometrium Study (LES) was supported by the Verelst Foundation for Endometrial Cancer. The Mayo Endometrial Cancer Study (MECS) and Mayo controls (MAY) were supported by grants from the National Cancer Institute of the US Public Health Service (R01 CA122443, P30 CA15083 and P50 CA136393), the Fred C. and Katherine B. Andersen Foundation, the Mayo Foundation and the Ovarian Cancer Research Fund with support of the Smith family, in memory of Kathryn Sladek Smith. MoMaTEC received financial support from a Helse Vest Grant, the University of Bergen, the Melzer Foundation, the Norwegian Cancer Society (Harald Andersens legat), the Research Council of Norway and Haukeland University Hospital. The Newcastle Endometrial Cancer Study (NECS) acknowledges contributions from the University of Newcastle, the NBN Children's Cancer Research Group, Jennie Thomas and the Hunter Medical Research Institute. RENDOCAS was supported through the regional agreement on medical training and clinical research (ALF) between the Stockholm County Council and Karolinska Institutet (20110222, 20110483, 20110141 and DF 07015), Swedish Labor Market Insurance (100069) and the Swedish Cancer Society (11 0439). The Cancer Hormone Replacement Epidemiology in Sweden study (CAHRES; formerly called the Singapore and Swedish Breast/Endometrial Cancer study, SASBAC) was supported by funding from the Agency for Science, Technology and Research of Singapore (A*STAR), the US National Institutes of Health and the Susan G. Komen Breast Cancer Foundation.
BCAC is funded by Cancer Research UK (C1287/A10118 and C1287/A12014). OCAC is supported by a grant from the Ovarian Cancer Research Fund thanks to donations by the family and friends of Kathryn Sladek Smith (PPD/RPCI.07) and the UK National Institute for Health Research Biomedical Research Centres at the University of Cambridge.
Additional funding for individual control groups is detailed in the Supplementary Note.
Endometrial cancer case and control sample sets.
Meta-analysis after regional imputation for risk loci with P < 1 × 10−5 identified by meta-analysis of GWAS and iCOGS data sets.
Overall meta-analysis including additional genotyping from phase 2.
Genotyping concordance rates for different platforms in quality control duplicates.
Endometrial tissue eQTLs: association between GWAS risk locus genotypes and transcript levels of nearby genes.
Functional annotation of SNPs in LD with GWAS risk loci (r2 >0.7 in 1000 Genomes Project EUR) from HaploReg, RegulomeDB and ENCODE.
Pairwise t-test P values for 13q22 luciferase assays.
Primers and oligonucleotides used in experimental procedures.