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Background The efficacy of endoscopic submucosal dissection (ESD) for undifferentiated early gastric cancer (UD EGC) is controversial due to the relatively high risk of lymph node metastasis. We compared long-term clinical outcomes of UD EGC between ESD and surgical resection groups. Methods We retrospectively reviewed the medical records of patients with UD EGC treated by either ESD or surgical...
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