Gastroenteropancreatic neuroendocrine tumours: an overview.

Gastroenteropancreatic neuroendocrine tumours (GEP-NET) represent a heterogeneous family of diseases of often challenging clinical management. Although many GEP-NET are slow progressing and frequently less aggressive than neoplasms of other origin, they can metastasise and reduce the life span of the patient. GEP-NET can be functioning (secreting hormones that may cause symptoms and organ damage), but some 60% are non-functioning. Thorough clinical assessment including family history, biochemical tests, radiology and nuclear medicine scans, and histological confirmation are important to tailor the optimal treatment of GEP-NET, which should be managed with a multidisciplinary approach and mainly guided by tumour grading and staging, functioning status, and location of the primary lesion.