Abstract
Purpose
A relationship of Epstein–Barr virus (EBV) and breast cancer etiology and outcome may have clinical utility and potential to enhance understanding of tumor biology. Research to date has yielded variable results, likely reflecting differing virus detection assays and unaddressed epidemiologic heterogeneity across studies.
Methods
Applying our novel, five-target assay detection strategy in an exploratory study, we examined demographic, clinical, and tumor characteristics, and overall survival, associated with EBV positivity in breast adenocarcinomas from 59 non-Hispanic white and 68 Hispanic women sampled by age (<50, 50+) and stage (localized, regional/remote) and examined associations based on single assay targets.
Results
EBV was localized only to lymphocytes. Nevertheless, viral prevalence, although low, varied across patient subgroups. Adjusted odds ratios (OR) for EBV positivity were lower for younger Hispanic than white women (p interaction = 0.05), and marginally higher for larger [OR (95% confidence intervals) 1.03 (1.00–1.05) per mm increase] and right-sided [2.8 (0.97–7.8)] tumors. In whites, ORs were marginally higher for larger tumors [1.04 (1.00–1.07)] and marginally lower for age 50+ [0.24 (0.06–1.03)]; in Hispanics, ORs were higher for ER negative [5.6 (1.1–30.5)], and marginally higher for right-sided, tumors [5.8 (0.94–36.2)]. Survival was suggestively poorer for EBV-positive than EBV-negative tumors in older women with localized disease. EBV associations differed across single assay targets, indicating variation in prior findings likely due to assay performance.
Conclusions
The differing EBV associations by age and race/ethnicity suggest a non-random role of EBV in breast cancer and support further study using multi-target assays, relevant epidemiologic design, and a larger study sample.
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Acknowledgments
The authors acknowledge contributions to this study by the late Sarah Shema, Sandra Elmore, Patricia Weeks, Rita Leung, David O. Nelson, and Meg McKinley. The collection of cancer incidence data used in this study was supported by the California Department of Health Services as part of the state-wide cancer-reporting program mandated by California Health and Safety Code, Section 103885; by the National Cancer Institute’s Surveillance, Epidemiology, and End Results Program under contracts N01-PC-35136 awarded to the Cancer Prevention Institute of California, N02-PC-15105 awarded to the Public Health Institute, HHSN261201000140C awarded to the Cancer Prevention Institute of California, HHSN261201000035C awarded to the University of Southern California, and HHSN261201000034C awarded to the Public Health Institute; and the Centers for Disease Control and Prevention’s National Program of Cancer Registries, under agreements U55/CCR921930-02 awarded to the Public Health Institute and U58DP003862-01 awarded to the California Department of Public Health. The ideas and opinions expressed herein are those of the authors, and endorsement by the State of California Department of Public Health, the National Cancer Institute, and the Centers for Disease Control and Prevention or their contractors and subcontractors is not intended nor should be inferred.
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This work was supported in part by the California Breast Cancer Research Program (9WB-0005) (Dr. Glaser), the National Cancer Institute (R03 CA101500) (Dr. Gulley), and the Safeway Foundation (Dr. Glaser).
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Dr. Clarke has received institutional support for breast cancer research from Genentech and Grail Bio. The other authors declare that they have no conflict of interest.
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This article does not contain any studies with human participants or animals performed by any of the authors.
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This article did not involve human participants and informed consent was not required by the Institutional Review Boards reviewing the study.
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Glaser, S.L., Canchola, A.J., Keegan, T.H.M. et al. Variation in risk and outcomes of Epstein–Barr virus-associated breast cancer by epidemiologic characteristics and virus detection strategies: an exploratory study. Cancer Causes Control 28, 273–287 (2017). https://doi.org/10.1007/s10552-017-0865-3
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DOI: https://doi.org/10.1007/s10552-017-0865-3