 Gastroentero-pancreatic neuroendocrine tumours GEP-NETs are generally classified as rare diseases. Little is known about their cell biology and their mechanistic regulation. During the last years, the incidence of GEP-NETs is continuously increasing worldwide. In parallel, novel treatment options are currently evaluated which may substantially improve prognosis of patients with NETs. Data on such tumours in Switzerland, however, is scarce and treatment strategies vary throughout the country. 