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Background According to the Japanese Gastric Cancer Treatment Guidelines, the expanded criteria for endoscopic resection (ER) of undifferentiated-type early gastric cancer (UEGC) is ulcer-negative, intramucosal cancer 20 mm or less in diameter without lymphovascular invasion. The aim of this study was to confirm validity of the expanded criteria for curative ER of UEGC. Methods Subjects were 125...
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