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Endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD) is an effective alternative treatment for early gastric cancer. However, a major concern is the likelihood of lymph node metastasis. From December 1987 to December 2006, 391 patients who underwent curative surgery for gastric cancer with mucosal (T1a, n = 265) or submucosal (T1b, n = 126) invasion and a retrieved lymph node...
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