Identification of six new susceptibility loci for invasive epithelial ovarian cancer

Abstract

Genome-wide association studies (GWAS) have identified 12 epithelial ovarian cancer (EOC) susceptibility alleles. The pattern of association at these loci is consistent in BRCA1 and BRCA2 mutation carriers who are at high risk of EOC. After imputation to 1 1000 Genomes Project data, we assessed associations of 11 11 11 11 million genetic variants with EOC risk from 1 15,437 cases unselected for family history and 30,845 controls and from 1 15,252 BRCA1 mutation carriers and 8,211 11 BRCA2 mutation carriers (3,096 with ovarian cancer), and we combined the results in a meta-analysis. This new study design yielded increased statistical power, leading to the discovery of six new EOC susceptibility loci. Variants at 1 1p36 (nearest gene, WNT4), 4q26 (SYNPO2), 9q34.2 (ABO) and 1 17q1111.2 (ATAD5) were associated with EOC risk, and at 1 1p34.3 (RSPO1) and 6p22.1 1 (GPX6) variants were specifically associated with the serous EOC subtype, all with P < 5 × 1 10−8. Incorporating these variants into risk assessment tools will improve clinical risk predictions for BRCA1 and BRCA2 mutation carriers.