Journal of Gastric Cancer

The Korean Gastric Cancer Association (대한위암학회)
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Extragastric Metastasis of Early Gastric Cancer After Endoscopic Submucosal Dissection With Lymphovascular Invasion and Negative Resected Margins

  • Lee, Han Myung (Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine) ;
  • Kwak, Yoonjin (Department of Pathology, Seoul National University Hospital, Seoul National University College of Medicine) ;
  • Chung, Hyunsoo (Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine) ;
  • Kim, Sang Gyun (Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine) ;
  • Cho, Soo-Jeong (Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine)
  • Received : 2022.05.19
  • Accepted : 2022.08.16
  • Published : 2022.10.31
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Abstract

Purpose: Lymphovascular invasion is a criterion for non-curative resection in patients who have undergone endoscopic submucosal dissection (ESD) for early gastric cancer (EGC). We aimed to determine the rate of extragastric metastasis (EGM) and identify the predictors of EGM in patients with negative resection margins (R0 resection) and lymphovascular invasion in post-ESD pathology. Materials and Methods: A total of 2,983 patients underwent ESD for EGC. Among them, 110 had a pathology of R0 resection and positive lymphovascular invasion. Patients underwent additional gastrectomy (n=63) or further follow-up without gastrectomy (n=47). Results: The 110 patients were assigned to one of the 3 groups according to ESD indications based on post-ESD pathology. The first group satisfied the absolute indication for ESD (n=18), the second group satisfied the expanded indications for ESD (n=34), and the last group satisfied the beyond indication (n=58). The number of occurrences of EGM in each group was 1 (5.6%), 3 (8.8%), and 3 (5.2%), respectively. The logistic regression analysis adjusted for age, sex, tumor size, and indication for ESD, showed that larger tumor size was associated with EGM (odds ratio, 1.76; 95% confidence interval, 1.00-3.10; P=0.048). In contrast, ESD indication criteria did not affect EGM (P=0.349). Conclusions: Tumor size was the only predictive indicator for EGM in patients who underwent R0 resection and lymphovascular invasion on post-ESD pathology. Even patients with pathology corresponding to the absolute indication criteria of ESD had lymphovascular invasion, which means that they require additional gastrectomy due to the risk of EGM.

Keywords

Acknowledgement

This study was supported by grants from the National Research Foundation of Korea (#NRF-2019R1A2C1009923, #NRF-2022R1A2B5B01001430) and the Korean College of Helicobacter and Upper Gastrointestinal Research Foundation (KCHUGR - 202002001).

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