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A neoplasm with neuroendocrine differentiation arising from the gastrointestinal system. It includes neuroendocrine tumors (well-differentiated endocrine tumors or carcinoid tumors and well differentiated endocrine carcinomas) and neuroendocrine carcinomas (poorly differentiated neuroendocrine carcinomas, small cell carcinomas, and large cell neuroendocrine carcinomas). Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C27721\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C27721\' NCI Thesaurus)
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