Background: This study aimed to investigate risk factors for lymph node (LN) or distant metastasis after non-curative endoscopic resection (ER) of undifferentiated-type early gastric cancer (EGC). Methods: Of 1124 patients who underwent ER for undifferentiated-type gastric cancer at 18 tertiary hospitals across six geographic areas in Korea between 2005 and 2014, 634 with non-curative ER beyond the expanded criteria were retrospectively enrolled. According to the treatment after ER, patients were divided into additional surgery (n = 270) and follow-up (n = 364) groups. The median follow-up duration was 59 months for recurrence and 84 months for mortality. Results: LN metastasis was found in 6.7% (18/270) of patients at surgery. Ulcer [odds ratio (OR) 3.83; 95% confidence interval (CI) 1.21–12.13; p = 0.022] and submucosal invasion (OR 10.35; 95% CI 1.35–79.48; p = 0.025) were independent risk factors. In the follow-up group, seven patients (1.9%) developed LN or distant recurrence. Ulcer [hazard ratio (HR) 7.60; 95% CI 1.39–35.74; p = 0.018], LVI (HR 6.80; 95% CI 1.07–42.99; p = 0.042), and positive vertical margin (HR 6.71; 95% CI 1.28–35.19; p = 0.024) were independent risk factors. In the overall cohort, LN metastasis rates were 9.6% in patients with two or more risk factors and 1.2% in those with no or one risk factor. Conclusions: LVI, ulcer, submucosal invasion, and positive vertical margin are independently associated with LN or distant metastasis after non-curative ER of undifferentiated-type EGC. Surgical resection is strongly recommended for patients with two or more risk factors.
|Number of pages||11|
|Publication status||Published - 2021 Jan|
Bibliographical noteFunding Information:
The authors also acknowledge the valuable contribution of Boram Park, PhD, Biostatistics Collaboration Team, Research Core Center, Research Institute, National Cancer Center, Goyang, Korea, who provided statistical analyses of data.
This work was supported by the Korean College of Helicobacter and Upper Gastrointestinal Research (Woon Geon Shin 2017 and Hyo-Joon Yang 2018) and by the National Research Foundation of Korea (Grant No. 2020R1G1A1010927). Acknowledgements
© 2020, The International Gastric Cancer Association and The Japanese Gastric Cancer Association.
All Science Journal Classification (ASJC) codes
- Cancer Research