Shared genetics underlying epidemiological association between endometriosis and ovarian cancer

Language
en
Document Type
Article
Issue Date
2016-09-08
Issue Year
2015
Authors
Lu, Yi
Cuellar-Partida, Gabriel
Painter, Jodie N.
Nyholt, Dale R.
Morris, Andrew P.
Fasching, Peter A.
Hein, Alexander
Burghaus, Stefanie
Beckmann, Matthias W.
Lambrechts, Diether
Editor
Abstract

Epidemiological studies have demonstrated associations between endometriosis and certain histotypes of ovarian cancer, including clear cell, low-grade serous and endometrioid carcinomas. We aimed to determine whether the observed associations might be due to shared genetic aetiology. To address this, we used two endometriosis datasets genotyped on common arrays with full-genome coverage (3194 cases and 7060 controls) and a large ovarian cancer dataset genotyped on the customized Illumina Infinium iSelect (iCOGS) arrays (10 065 cases and 21 663 controls). Previous work has suggested that a large number of genetic variants contribute to endometriosis and ovarian cancer (all histotypes combined) susceptibility. Here, using the iCOGS data, we confirmed polygenic architecture for most histotypes of ovarian cancer. This led us to evaluate if the polygenic effects are shared across diseases. We found evidence for shared genetic risks between endometriosis and all histotypes of ovarian cancer, except for the intestinal mucinous type. Clear cell carcinoma showed the strongest genetic correlation with endometriosis (0.51, 95% CI = 0.18–0.84). Endometrioid and low-grade serous carcinomas had similar correlation coefficients (0.48, 95% CI = 0.07–0.89 and 0.40, 95% CI = 0.05–0.75, respectively). High-grade serous carcinoma, which often arises from the fallopian tubes, showed a weaker genetic correlation with endometriosis (0.25, 95% CI = 0.11–0.39), despite the absence of a known epidemiological association. These results suggest that the epidemiological association between endometriosis and ovarian adenocarcinoma may be attributable to shared genetic susceptibility loci.

Journal Title
Human Molecular Genetics
Volume
24
Issue
20
Citation
Human Molecular Genetics 24.20 (2015): S. 5955-5964. <http://hmg.oxfordjournals.org/content/24/20/5955.abstract>
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