The participants at the conference were asked to focus on the relevant literature published between 2011 and 2015. They met over two and a half days, in which data and new evidence were presented. The participants then retreated to break-out sessions according to their disciplines and were required to answer questions listed in a workbook created by the session chairs and the organizing committee. The workbook questions were tailored on the text of the initial guidelines framework [2, 4], focusing on the new available evidence. All relevant areas were updated via a thorough literature review and the questions that the chairpersons considered appropriate to discuss the new evidence. All participants were encouraged to challenge the document. Recent data on new evidence and insights were intensely discussed in working-group sessions as well as during the plenary session. Notes were taken continuously, so that the final agreement on each question was noted and returned to each session chair for preparation of the consensus statements. The magnitude of the consensus for each answer was estimated to achieve unanimity. In addition to providing textual guidelines, delegates were requested to elaborate accurate but simple

Several guidelines and standards of care on the management of neuroendocrine tumors (NETs) have been published by expert national and international groups in recent years [1–9]; additional changes in how these patients are managed are evolving rapidly, and since the last European Neuroendocrine Tumor Society (ENETS) Guidelines in 2011/12 [8], new important data have become available pertaining to novel diagnostic tools and therapies. On October 30th and 31st, 2014, the ENETS held an Advisory Board meeting in Vienna aiming at critically discussing and updating the ENETS Guidelines on the Diagnosis and Treatment of Neuroendocrine Tumors generated initially in 2005–2006 [2, 4] and revised in 2011 [8].