[Consensus and controversy of endoscopic diagnosis and treatment of gastroenteropancreatic neuroendocrine tumors].

Neuroendocrine neoplasms(NENs) are relatively rare tumors originating from the diffuse neuroendocrine system, and gastrointestinal tract is one of the most common location of the tumors. Currently, the European Neuroendocrine Neoplasm Society (ENETS) and the National Comprehensive Cancer Network (NCCN) have released the international guidelines for NENs management. And also, experts from Chinese Society of Clinical Oncology (CSCO) have proposed "The Consensus on Gastroenteropancreatic Neuroendocrine Neoplasm in China" in 2016, which is also one of the most important reference standard for the diagnosis and treatment of gastroenteropancreatic(GEP) NENs in China. Here we will interpret these three guidelines or consensus. There are few controversies about endoscopic management principle for GEP-NEN of different locations and sizes among these three guidelines or consensus, but for small NENs without involving intrinsic muscularis, endoscopic resection is recommended and considered. We hope that this interpretation may help clinicians for clinical decision making.