Overview: What Are Neuroendocrine Tumors?
Neuroendocrine tumors (NETs) are a group of uncommon cancers that start in specialized cells called neuroendocrine cells. These cells act like a mix between nerve cells and hormone-producing (endocrine) cells. They are found throughout the body — especially in the lungs, pancreas, and digestive tract. Because of their dual role, tumors that develop in these cells can sometimes make excess hormones, leading to unusual symptoms.