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Krystallenia I Alexandraki Department of Pathophysiology, Neuroendocrine Tumor Unit, Oxford Centre for Diabetes, National University of Athens, Greece

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Gregory A Kaltsas Department of Pathophysiology, Neuroendocrine Tumor Unit, Oxford Centre for Diabetes, National University of Athens, Greece

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Simona Grozinsky-Glasberg Department of Pathophysiology, Neuroendocrine Tumor Unit, Oxford Centre for Diabetes, National University of Athens, Greece

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Eleftherios Chatzellis Department of Pathophysiology, Neuroendocrine Tumor Unit, Oxford Centre for Diabetes, National University of Athens, Greece

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Ashley B Grossman Department of Pathophysiology, Neuroendocrine Tumor Unit, Oxford Centre for Diabetes, National University of Athens, Greece

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recent series report rather different findings; in one case series, including eight patients who had a completion right hemicolectomy (RHC) in aNENs <1 cm in diameter, LN involvement was found in a single patient (12.5%); larger tumours ≥2 cm had a 57

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R Sutton Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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H E Doran Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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E M I Williams Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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J Vora Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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S Vinjamuri Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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J Evans Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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F Campbell Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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M G T Raraty Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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P Ghaneh Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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M Hartley Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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G J Poston Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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J P Neoptolemos Department of Surgery, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK. r.sutton@liv.ac.uk

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Many clinicians prefer to avoid surgery in patients with carcinoid neoplasia, because of its slow growth and relatively favourable prognosis. Nevertheless, the commonest cause of death in patients with carcinoid is advanced metastatic disease, and both clinical and epidemiological data indicate that the more effectively the disease is ablated, the more long-lasting the benefit. Multidisciplinary management of patients with carcinoid must consider inherited risk, possible multiple carcinoids and/or synchronous non-carcinoid cancer, and the use of a range of investigations that also evaluate the 10% of patients with carcinoid syndrome with or without valvular heart disease. Although primary size is correlated with the presence of nodal with or without liver metastases, carcinoid tumours <1 cm in diameter may be metastatic at presentation, particularly those arising within the small intestine. In the jejunum and ileum, resection of all sizes of carcinoid with local and regional nodes is preferred, to prevent nodal dissemination causing mesenteric ischaemia with or without infarction. Resection of nodal metastases should be undertaken in those with persistent or recurrent nodal disease if possible. Appendiceal and right colonic carcinoids are most effectively treated by right hemicolectomy with local and regional nodal clearance, as for adenocarcinoma. However, for most appendiceal carcinoids which are <1 cm in diameter and non-invasive, appendicectomy alone is sufficient. For appendiceal carcinoids 1-2 cm in diameter, histopathological assessment helps to determine the need for hemicolectomy. Liver resection has been followed by prolonged 5 year survival in several series and is recommended in appropriate patients to attempt cure or to debulk metastatic disease. Liver transplantation has had only qualified success in highly selected patients without extra-hepatic disease in whom other therapies have failed.

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Sonia M Abuzakhm OhioHealth, Columbus, Ohio, USA

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Vineeth Sukrithan The Ohio State University Comprehensive Cancer Center, Columbus, Ohio, USA

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Briant Fruth Mayo Clinic, Rochester, Minnesota, USA

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Rui Qin Janssen Pharmaceuticals, Raritan, New Jersey, USA

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Jonathan Strosberg H. Lee Moffitt Cancer Center & Research Institute, Tampa, Florida, USA

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Timothy J Hobday Mayo Clinic, Rochester, Minnesota, USA

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Thomas Semrad Tahoe Forest Cancer Center, Truckee, California, USA

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Diane Reidy-Lagunes Memorial Sloan Kettering Cancer Center, New York, New York, USA

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Hedy Lee Kindler University of Chicago Medical Center, Chicago, Illinois, USA

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George P Kim George Washington University Cancer Center, Washington, DC, USA

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Jennifer J Knox Princess Margaret Cancer Centre, Toronto, ON, Canada

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Andreas Kaubisch Montefiore Medical Center, Bronx, New York, USA

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Miguel Villalona-Calero City of Hope, Duarte, California, USA

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Helen Chen CTEP National Cancer Institute, Bethesda, Maryland, USA

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Charles Erlichman Mayo Clinic, Rochester, Minnesota, USA

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Manisha H Shah The Ohio State University Comprehensive Cancer Center, Columbus, Ohio, USA

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treatment-related colonic perforation and required an emergent right hemi-colectomy. She was removed from the study on the date of surgery and died 13 days later. Table 3 Laboratory adverse events. Laboratory adverse events a Number of

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Mohid S Khan Neuroendocrine Tumour Unit, Centre for Gastroenterology, Royal Free Hospital, 10th Floor, London NW3 2QG, UK

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Martyn E Caplin Neuroendocrine Tumour Unit, Centre for Gastroenterology, Royal Free Hospital, 10th Floor, London NW3 2QG, UK

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appendicitis. When the tumour is at the base of appendix, or ≥20 mm diameter, or shows >3 mm mesoappendiceal invasion, or histology suggests goblet cell (adenocarcinoid), a right hemicolectomy (open or laparoscopic) with locoregional lymphadenectomy is usually

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Irvin M Modlin Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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Ignat Drozdov Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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Daniele Alaimo Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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Stephen Callahan Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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Nancy Teixiera Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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Lisa Bodei Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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Mark Kidd Wren Laboratories 35 NE Industrial Road, Branford, Connecticut 06405, USA

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assessed as stable disease following previous resection (right hemicolectomy (<1 cm small intestinal NET: n =1), pancreas resection (<1 cm insulinomas: n =2)) and were currently not receiving any treatment. Three (7%) of the age: sex matched control group

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