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Site distribution of gastroenteropancreatic neuroendocrine tumors in Korea according to the 2000 WHO classification. The most common tumor is WDET in rectum. WHO, World Health Organization; WDET, well-differntiated endocrine tumor; MEC, metastatic endocrine carcinoma, MEEC, mixed exocrine-endocrine carcinoma; PDEC, poorly differentiated endocrine carcinoma/small cell carcinoma; WDEC, well-differentiated endocrine carcinoma.
