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Review
. 2018 May 29;10(6):167.
doi: 10.3390/cancers10060167.

Clinical Importance of Epstein⁻Barr Virus-Associated Gastric Cancer

Affiliations
Review

Clinical Importance of Epstein⁻Barr Virus-Associated Gastric Cancer

Jun Nishikawa et al. Cancers (Basel). .

Abstract

Epstein⁻Barr virus-associated gastric carcinoma (EBVaGC) is the most common malignancy caused by EBV infection. EBVaGC has definite histological characteristics similar to gastric carcinoma with lymphoid stroma. Clinically, EBVaGC has a significantly low frequency of lymph node metastasis compared with EBV-negative gastric cancer, resulting in a better prognosis. The Cancer Genome Atlas of gastric adenocarcinomas proposed a molecular classification divided into four molecular subtypes: (1) EBVaGC; (2) microsatellite instability; (3) chromosomal instability; and (4) genomically stable tumors. EBVaGC harbors a DNA methylation phenotype, PD-L1 and PD-L2 overexpression, and frequent alterations in the PIK3CA gene. We review clinical importance of EBVaGC and discuss novel therapeutic applications for EBVaGC.

Keywords: DNA methylation; Epstein–Barr virus; endoscopic mucosal resection (EMR); endoscopic submucosal dissection (ESD); gastric carcinoma; immune checkpoint inhibitor; programed cell death 1 (PD-1); programmed cell death ligand 1 (PD-L1).

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Conflict of interest statement

The authors declare no financial or commercial conflicts of interest.

Figures

Figure 1
Figure 1
Histologic characteristic of Epstein–Barr virus-associated gastric carcinoma (EBVaGC). (a) EBV-encoded small ribonucleic acid (EBER1) in situ hybridization shows positive nuclei in the carcinoma cells, which are surrounded by infiltrating lymphocytes (×100); (b) Histologic characteristic of EBVaGC. The “lacy pattern” is composed of irregularly anastomosing tubules and moderate to dense lymphocytic infiltration (×100).
Figure 2
Figure 2
Endoscopic images of an EBV-associated gastric carcinoma. Submucosal tumor-like morphology is one of the features of EBVaGC.
Figure 3
Figure 3
Treatment by DNA demethylating agents for EBVaGC.
Figure 4
Figure 4
Treatment by blocking PD-1/PD-L1 for EBVaGC.

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