A Study Which Compares the Long Term and Short Term Outcomes Between Endoscopic Submucosal Dissection and Surgery in the Treatment of Early Gastric Cancer

In this study, patients who are going to undergo endoscopic submucosal dissection (ESD) or surgery for early gastric cancer will be enrolled and divided into ESD group and Surgery group according to the procedure they go through. The patients will be followed up for at least 5 years after ESD or surgery. Esophagogastroduodenoscopy (EDG) and biopsy will be performed 3 months and then 6 months after ESD or surgery. Thereafter, EDG will be performed along with biopsy and abdominal computed tomography annually up to 5 years. Patients' data such as age, sex, clinical diagnosis, achievement of en-bloc resection, pathological outcomes, complications and survival condition will be prospectively collected. Statistical methods such as Student's t-test, the chi-square test, the Kaplan-Meier method and the log-rank test will be used to compare the short term and long term outcomes between the ESD group and the surgery group.