Identification of novel common breast cancer risk variants at the 6q25 locus among Latinas

• Published in: Breast cancer research : BCR Vol. 21; no. 1; p. 3
• Main Authors: Hoffman, Joshua, Fejerman, Laura, Hu, Donglei, Huntsman, Scott, Li, Min, John, Esther M, Torres-Mejia, Gabriela, Kushi, Larry, Ding, Yuan Chun, Weitzel, Jeffrey, Neuhausen, Susan L, Lott, Paul, Echeverry, Magdalena, Carvajal-Carmona, Luis, Burchard, Esteban, Eng, Celeste, Long, Jirong, Zheng, Wei, Olopade, Olufunmilayo, Huo, Dezheng, Haiman, Christopher, Ziv, Elad
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 14.01.2019; BioMed Central; BMC
• Subjects: Adult; Aged; Asians; Breast; Breast cancer; Breast Neoplasms - genetics; Cancer research; Case-Control Studies; Chromosome 6; Chromosome Mapping; Chromosomes, Human, Pair 6 - genetics; Datasets as Topic; Disease susceptibility; Female; Fine mapping; Gene mapping; Genetic aspects; Genetic diversity; Genetic Loci - genetics; Genetic polymorphisms; Genetic Predisposition to Disease; Genetic research; Genome wide association study; Genomes; Genomics; Health aspects; Health risk assessment; Hispanic American women; Hispanic Americans; Hispanic Americans - genetics; Hispanic/Latino populations; Hormone replacement therapy; Humans; Linkage disequilibrium; Mexican American literature; Middle Aged; Novels; Polymorphism, Single Nucleotide; Population; Regression analysis; Risk factors; Single nucleotide polymorphisms; Single-nucleotide polymorphism; Studies; Womens health; United States > US; Genome wide association study; Fine mapping; Hispanic/Latino populations
• ISSN: 1465-542X; 1465-5411; 1465-542X
• DOI: 10.1186/s13058-018-1085-9

Breast cancer is a partially heritable trait and genome-wide association studies (GWAS) have identified over 180 common genetic variants associated with breast cancer. We have previously performed breast cancer GWAS in Latinas and identified a strongly protective single nucleotide polymorphism (SNP) at 6q25, with the protective minor allele originating from indigenous American ancestry. Here we report on fine mapping of the 6q25 locus in an expanded sample of Latinas. We performed GWAS in 2385 cases and 6416 controls who were either US Latinas or Mexican women. We replicated the top SNPs in 2412 cases and 1620 controls of US Latina, Mexican, and Colombian women. In addition, we validated the top novel variants in studies of African, Asian and European ancestry. In each dataset we used logistic regression models to test the association between SNPs and breast cancer risk and corrected for genetic ancestry using either principal components or genetic ancestry inferred from ancestry informative markers using a model-based approach. We identified a novel set of SNPs at the 6q25 locus associated with genome-wide levels of significance (p = 3.3 × 10 - 6.0 × 10 ) not in linkage disequilibrium (LD) with variants previously reported at this locus. These SNPs were in high LD (r  > 0.9) with each other, with the top SNP, rs3778609, associated with breast cancer with an odds ratio (OR) and 95% confidence interval (95% CI) of 0.76 (0.70-0.84). In a replication in women of Latin American origin, we also observed a consistent effect (OR 0.88; 95% CI 0.78-0.99; p = 0.037). We also performed a meta-analysis of these SNPs in East Asians, African ancestry and European ancestry populations and also observed a consistent effect (rs3778609, OR 0.95; 95% CI 0.91-0.97; p = 0.0017). Our study adds to evidence about the importance of the 6q25 locus for breast cancer susceptibility. Our finding also highlights the utility of performing additional searches for genetic variants for breast cancer in non-European populations.