We propose to discover novel markers of genetic susceptibility for breast cancer using the combined resources of four large on-going epidemiologic studies of African American women. Our collaboration includes the Carolina Breast Cancer Study, Women's Circle of Health Study, Black Women's Health Study, and the Multiethnic Cohort. DNA samples from a total of 5534 African American cases and 5534 controls will be available for analysis, along with in-person interview data and tumor blocks from cases. Three avenues of investigation are proposed: (1) Dense genotyping and fine-mapping of loci identified in previous genome-wide association studies (GWAS) of breast cancer and related candidate genes, with a particular focus on fine-mapping of loci relevant to African American women. Included in the fine-mapping is a unique locus on chromosome 5q31 we recently identified in a GWAS of African American women;(2) Discovery of potential functional alleles using targeted DNA resequencing and gene expression-based approaches;(3) Statistical analyses aimed at identifying genetic risk factors for subgroups of breast cancer cases defined by early age at onset and tumor biology (ER status and intrinsic subtypes: basal-like, luminal A, luminal B, HER2+/ER-). The combined resources of four epidemiologic studies will facilitate identification of at-risk alleles and haplotypes, permit rapid replication of findings, and produce more precise estimates of effect for breast cancer subgroups. Genotyping and other laboratory studies will be conducted in cooperation with the Biospecimen Core, recruitment and enrollment of additional study participants will be undertaken by the Data Collection Core, and statistical analyses will be conducted in cooperation with the Biostatistics and Data Management Core. Genotype data from Project 1 will be used in conjunction with Projects 2, 3 and 4 to develop complex models for breast cancer susceptibility that incorporate genetic markers, modifiable environmental risk factors, and breast cancer tumor subtypes as distinct disease outcomes.
The lack of major findings regarding genetic variants that may increase risk of breast cancer, particularly in AA women, is likely due to lack of consideration for different types of breast cancer. By identifying breast cancer subtypes, this Project will be able to determine genes that increase risk of aggressive, early onset breast cancer in AA women. Results will help to understand the causes of aggressive breast cancer in AA women, and women with combinations of high-risk genotypes can be targeted for prevention.
|Ruiz-NarvÃ¡ez, Edward A; Sucheston-Campbell, Lara; Bensen, Jeannette T et al. (2016) Admixture Mapping of African-American Women in the AMBER Consortium Identifies New Loci for Breast Cancer and Estrogen-Receptor Subtypes. Front Genet 7:170|
|Bethea, Traci N; Rosenberg, Lynn; Castro-Webb, Nelsy et al. (2016) Family History of Cancer in Relation to Breast Cancer Subtypes in African American Women. Cancer Epidemiol Biomarkers Prev 25:366-73|
|Ruiz-NarvÃ¡ez, Edward A; Haddad, Stephen A; Lunetta, Kathryn L et al. (2016) Gene-based analysis of the fibroblast growth factor receptor signaling pathway in relation to breast cancer in African American women: the AMBER consortium. Breast Cancer Res Treat 155:355-63|
|Palmer, Julie R; Gerlovin, Hanna; Bethea, Traci N et al. (2016) Predicted 25-hydroxyvitamin D in relation to incidence of breast cancer in a large cohort of African American women. Breast Cancer Res 18:86|
|Bertrand, Kimberly A; Bethea, Traci N; Adams-Campbell, Lucile L et al. (2016) Differential patterns of risk factors for early-onset breast cancer by ER status in African American women. Cancer Epidemiol Biomarkers Prev :|
|Rosenberg, Lynn; Bethea, Traci N; Viscidi, Emma et al. (2016) Postmenopausal Female Hormone Use and Estrogen Receptor-Positive and -Negative Breast Cancer in African American Women. J Natl Cancer Inst 108:|
|Chollet-Hinton, Lynn; Anders, Carey K; Tse, Chiu-Kit et al. (2016) Breast cancer biologic and etiologic heterogeneity by young age and menopausal status in the Carolina Breast Cancer Study: a case-control study. Breast Cancer Res 18:79|
|Allott, Emma H; Geradts, Joseph; Sun, Xuezheng et al. (2016) Intratumoral heterogeneity as a source of discordance in breast cancer biomarker classification. Breast Cancer Res 18:68|
|Cheng, Ting-Yuan David; Ambrosone, Christine B; Hong, Chi-Chen et al. (2016) Genetic variants in the mTOR pathway and breast cancer risk in African American women. Carcinogenesis 37:49-55|
|Cheng, Ting-Yuan David; Shankar, Jyoti; Zirpoli, Gary et al. (2016) Genetic variants in the mTOR pathway and interaction with body size and weight gain on breast cancer risk in African-American and European American women. Cancer Causes Control 27:965-76|
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