The prevalence and incidence of gastroenteropancreatic neuroendocrine tumors have been increasing. The Surveillance, Epidemiology, and End Results database reported a 20-year prevalence of 48 gastroenteropancreatic neuroendocrine tumors per 100 000 population and an incidence of 3.56 per 100 000 population per year in the US.
1 Compared with the aggressive course of high-grade neuroendocrine carcinomas, the natural evolution of well-differentiated gastroenteropancreatic neuroendocrine tumors is usually indolent, with a median overall survival (OS) of 14 to 30 years among patients with localized, radically resected forms.
1 However, approximately 50% of patients with gastroenteropancreatic neuroendocrine tumors have advanced disease at diagnosis.
2 For these patients, the prognosis is poor, with a median OS ranging from only 4 months to 6 years.
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