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Abstract:
Identifying genetic variants with pleiotropic associations can uncover
common pathways influencing multiple cancers. We took a two-stage
approach to conduct genome-wide association studies for lung, ovary,
breast, prostate, and colorectal cancer from the GAME-ON/GECCO Network
(61,851 cases, 61,820 controls) to identify pleiotropic loci. Findings
were replicated in independent association studies (55,789 cases,
330,490 controls). We identified a novel pleiotropic association at 1q22
involving breast and lung squamous cell carcinoma, with eQTL analysis
showing an association with ADAM15/THBS3 gene expression in lung. We
also identified a known breast cancer locus CASP8/ALS2CR12 associated
with prostate cancer, a known cancer locus atCDKN2B-AS1 with different
variants associated with lung adenocarcinoma and prostate cancer, and
confirmed the associations of a breast BRCA2 locus with lung and serous
ovarian cancer. This is the largest study to date examining pleiotropy
across multiple cancer-associated loci, identifying common mechanisms of
cancer development and progression. (C) 2016 AACR.