Characterization of Epstein Barr Virus Latency Pattern in Argentine Breast Carcinoma

Abstract

IntroductionEpstein-Barr virus (EBV)-associated tumors show different expression patterns of latency genes. Since in breast carcinoma this pattern is not yet fully described, our aim was to characterize EBV latency pattern in our EBV positive breast carcinoma series.MethodsThe study was conducted on 71 biopsies of breast carcinoma and in 48 non-neoplastic breast controls. EBNA1, LMP2A and LMP1 expression was assessed by immunohistochemistry with monoclonal antibodies, while viral genomic DNA and EBERs RNA transcripts expression was performed by in situ hybridization. EBV presence was confirmed by PCR.ResultsEBV genomic DNA and EBNA1 expression were detected in 31% (22/71) of patients specifically restricted to tumor epithelial cells in breast carcinoma while all breast control samples were negative for both viral DNA and EBNA1 protein. LMP2A was detected in 73% of EBNA1 positive cases, none of which expressed either LMP1 protein or EBERs transcripts.ConclusionsThese findings suggest that EBV expression pattern in the studied biopsies could be different from those previously observed in breast carcinoma cell lines and lead us to suggest a new, EBNA1, LMP2A positive and LMP1 and EBERs negative latency profile in breast carcinoma in our population.

Epstein-Barr Virus Infection and Risk of Breast Cancer: An Adaptive Meta-Analysis for Case-Control Studies

“…2016; 11(3):e34806. (11,18,(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53). Table 1 shows a summary of the EBV-DNA positive subjects according to nationality, types of sample, and kinds of control tissue in the 20 selected studies.…”

Co-prevalence of Epstein–Barr virus and high-risk human papillomaviruses in Syrian women with breast cancer

“…3 Several other recent studies, including 3 from the Middle East, showed clearly that EBV is present in 30-50% of human breast cancer. [4][5][6][7][8] Overall, these studies demonstrate that EBV is present in human breast cancer; given the biological actions of EBV-derived onco-proteins, it is quite possible that it plays an important role in the initiation and/or progression of this malignancy. This is based on our study as well as recent investigations about the role of LMP1 and EBNA1 onco-proteins of EBV in the initiation of epithelialmesenchymal transition (EMT) in human nasopharyngeal cancer.…”

Multiple Infections and Cancer: Implications in Epidemiology

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