Gastroenteropancreatic Neuroendocrine Tumours (GEP-NETs)
These tumours, also known as carcinoid tumours, represent an uncommon but important group of malignancies that occur throughout the gastrointestinal tract. They range from benign functional tumours (eg. insulinoma), benign non-functional neuroendocrine tumours (most common in the appendix or rectum), metastatic well-differentiated neuroendocrine tumours that may cause carcinoid syndrome, and poorly differentiated neuroendocrine tumours that are similar to small cell carcinoma of the lung.
