Neuroendocrine neoplasms (NEN) in children are rare. In Germany, children with NEN of the gastroenteropancreatic system are prospectively registered since 1997. The objective of this study was to evaluate diagnostics, treatment and outcome in children with extra-appendiceal NEN.Clinical data of 39 patients with NEN registered in the GPOH-MET 97 trial from 1997 to 2012 were analyzed. Children with NEN of the appendix were excluded.14 patients with pancreatic, 12 patients with bronchial, 6 patients with gastrointestinal, 2 patients with nasopharyngeal and 5 patients with NEN of unknown primary were registered. About half of the patients had localized disease and rather low grade tumors, including all bronchial NEN, 5 of 14 pancreatic and 2 of 6 gastrointestinal tumors. Metastatic disease and high grade tumors were stated in cases with nasopharyngeal tumors, NEN of unknown -primary and in part of pancreatic and gastrointestinal NEN. Complete surgical resection was performed in patients with localized NEN with an overall survival of 100%. In contrast, overall survival in metastatic disease was 26%.Outcome in children with low grade NEN and localized disease is excellent. Management of high grade tumors and metastatic disease remains challenging. Establishing international registries is inevitable for further improvements.
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