Journal of Gastric Cancer

The Korean Gastric Cancer Association (대한위암학회)
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Clinical Implications of Microsatellite Instability in Early Gastric Cancer

  • Kim, Dong Gyu (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • An, Ji Yeong (Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Kim, Hyunki (Department of Pathology, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Shin, Su-Jin (Department of Pathology, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Choi, Seohee (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Seo, Won Jun (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Roh, Chul Kyu (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Cho, Minah (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Son, Taeil (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Kim, Hyoung-Il (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Cheong, Jae-Ho (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Hyung, Woo Jin (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Noh, Sung Hoon (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine) ;
  • Choi, Yoon Young (Department of Surgery, Yonsei University Health System, Yonsei University College of Medicine)
  • Received : 2019.04.22
  • Accepted : 2019.10.07
  • Published : 2019.12.31
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Abstract

Purpose: We aimed to evaluate the clinical characteristics of microsatellite instability in early gastric cancer. Materials and Methods: The microsatellite instability status of resected early gastric tumors was evaluated using two mononucleotide repeat markers (BAT25 and BAT26) and three dinucleotide repeat markers (D5S346, D2S123, and D17S250). Tumors with instability in two or more markers were defined as microsatellite instability-high (MSI-H) and others were classified as microsatellite stable (MSS). Results: Overall, 1,156 tumors were included in the analysis, with 85 (7.4%) classified as MSI-H compared with MSS tumors. For MSI-H tumors, there was a significant correlation with the female sex, older age, tumor location in the lower gastric body, intestinal histology, lymphovascular invasion (LVI), and submucosal invasion (P<0.05). There was also a trend toward an association with lymph node (LN) metastasis (P=0.056). In mucosal gastric cancer, there was no significant difference in MSI status in tumors with LN metastasis or tumors with LVI. In submucosal gastric cancer, LVI was more frequently observed in MSI-H than in MSS tumors (38.9% vs. 25.0%, P=0.027), but there was no difference in the presence of LN metastases. The prognosis of MSI-H tumors was similar to that of MSS tumors (log-rank test, P=0.797, the hazard ratio for MSI-H was adjusted by age, sex, pT stage, and the number of metastatic LNs, 0.932; 95% confidence interval, 0.423-2.054; P=0.861). Conclusions: MSI status was not useful in predicting prognosis in early gastric cancer. However, the frequent presence of LVI in early MSI-H gastric cancer may help guide the appropriate treatment for patients, such as endoscopic treatment or limited LN surgical dissection.

Keywords

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