Women of African ancestry (AA) women are more likely than those with European ancestry (EA) to be diagnosed with breast cancer before age 45, and to have more aggressive tumors, characterized by high grade, with negative staining for estrogen and progesterone receptors and HER-2 (triple negative). They are also more likely to have basal-like breast tumors, an intrinsic breast cancer subtype with the poorest prognosis. The reasons for these disparities are unclear, and existing studies lack the statistical power to investigate risk factors for breast cancer subtypes among young women. In this Program Project, we will pool data and samples from the Carolina Breast Cancer Study (CBCS), the Black Women's Health Study (BWHS), the Women's Circle of Health Study (WCHS) and the Multi-ethnic Cohort (MEC) and continue to accrue cases for a final sample size of more than 5500 cases and 5500 controls. We will collect tissue blocks and classify cancers by their intrinsic subtypes, and investigate specific genetic, biologic and epidemiologic risk factors for subtypes in four highly interactive projects.
The specific aims are to examine associations between age at diagnosis and breast cancer subtypes and 1) genetic loci identified in recent GWAS findings, using fine-mapping to identify potential causal alleles;2) pregnancy history and lactation, and potential modification by genetic variants in related pathways;3) body size, early life and adult physical activity, and gene/environment interactions;and 4) risk factors that may have been adaptive in Africa to endemic infectious disease (robust immune response) and intense sunlight (high skin pigmentation), but that in western society may result in hyper-inflammatory milieu and vitamin D deficiency, which may be related to early, aggressive breast cancer. Interactive aims will investigate relationships between subtypes and genetic and biologic factors, as well as epidemiologic characteristics. Cores that support all of the projects include the 1) Administrative Core;2) Data Collection Core;3) Biospecimen Core;and 4) Biostatistics and Data Management Core. By pooling our data, specimens, and importantly, expertise to investigate these synergist hypotheses, we will elucidate much of the etiology of aggressive, early onset breast cancers in AA women.

Public Health Relevance

It is startling that there are few explanations for the aggressive, poor-prognosis breast cancers seen in African American (AA) women, particularly among younger AA women. By pooling data and expertise from four of the largest studies of breast cancer in AA women, we will be able to examine genetic, biological and epidemiological risk factors for specific forms of aggressive breast cancers. Identification of modifiable risk factors could have an important effect on reducing deaths associated with poor prognosis tumors among AA women.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Program Projects (P01)
Project #
1P01CA151135-01A1
Application #
8152881
Study Section
Special Emphasis Panel (ZCA1-GRB-S (M1))
Program Officer
Gillanders, Elizabeth
Project Start
2011-08-01
Project End
2016-07-31
Budget Start
2011-08-01
Budget End
2012-07-31
Support Year
1
Fiscal Year
2011
Total Cost
$3,798,244
Indirect Cost
Name
Roswell Park Cancer Institute Corp
Department
Type
DUNS #
824771034
City
Buffalo
State
NY
Country
United States
Zip Code
14263
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Yao, Song; Haddad, Stephen A; Hu, Qiang et al. (2016) Genetic variations in vitamin D-related pathways and breast cancer risk in African American women in the AMBER consortium. Int J Cancer 138:2118-26

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