Patient-oriented and professional organizations have contributed a lot to the management of neuroendocrine tumor (NET) patients, supporting various studies and updating approaches with consensus and guideline development. European Neuroendocrine Tumor Society (ENETS) has been the cornerstone for the development of guidelines and classification systems for these heterogeneous tumors. After the activities of ENETS, sister communities have also been established for similar purposes, such as North American Neuroendocrine Tumor Society (NANETS), the Asia-Pacific Neuroendocrine Tumors Society (AP-NET), Latin America Neuroendocrine Society (LANETS), and The Carcinoid-NeuroEndocrine Tumour Society (CNETS). All international communities have contributed to the guidelines for their regions in various ways. Communities established for similar purposes work to compile the current information and to create correct treatment algorithms for both health professionals and societies. Further development of collaboration between the different societies will contribute new perspectives and therapeutic procedures for NETs.