Epstein–Barr virus positivity, not mismatch repair-deficiency, is a favorable risk factor for lymph node metastasis in submucosa-invasive early gastric cancer

Ji Hye Park, Eun Kyung Kim, Yon Hee Kim, Jie Hyun Kim, Yoon Sung Bae, Yong Chan Lee, Jae Ho Cheong, Sung Hoon Noh, Hyunki Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Background: Epstein–Barr virus (EBV)-associated gastric cancer (GC) and microsatellite-instability-high GC are associated with a low prevalence of regional lymph node metastasis (LNM). To evaluate the feasibility of endoscopic treatment of EBV-associated and/or microsatellite-instability-high early GC (EGC), we analyzed the risk factors for LNM using a large series (n = 756) of submucosa-invasive (SM) EGC. Methods: EBV-encoded RNA in situ hybridization (EBER ISH) and immunohistochemistry for four mismatch repair (MMR) proteins (MLH1, PMS2, MSH2, and MSH6) were performed. The clinicopathologic features and results of EBER ISH and immunohistochemistry were compared according to the LNM status. Results: Among the cases, 146 EGCs (19.3 %) showed LNM. EBV negativity, larger tumor size (greater than 2 cm), deeper level of submucosal invasion, submucosal invasion depth greater than 500 µm, presence of ulceration, and presence of lymphovascular invasion (LVI) were associated with LNM. However, the MMR deficiency was not correlated with LNM. On multivariate regression analysis, larger tumor size (greater than 2 cm; odds ratio 1.6, p = 0.030), deeper level of submucosal invasion (odds ratio 2.9, p = 0.001), LVI (odds ratio 7.4, p < 0.001), and EBV negativity (p = 0.020) were independent risk factors for LNM in SM EGCs. Conclusions: EBV positivity was a favorable risk factor for LNM in SM EGC. However, MMR deficiency was not associated with the status of LNM. Thus, we suggest that examination with EBER ISH could be considered for endoscopic resected specimens, especially in cases of SM EGC showing no LVI and clear resection margins.

Original languageEnglish
Pages (from-to)1041-1051
Number of pages11
JournalGastric Cancer
Volume19
Issue number4
DOIs
Publication statusPublished - 2016 Oct 1

All Science Journal Classification (ASJC) codes

  • Oncology
  • Gastroenterology
  • Cancer Research

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