The pancreas is an abdominal gland consisting of two major parts, thus corresponding to the two types of pancreatic cancer. The endocrine part of the pancreas produces hormones, with insulin being the most notable. Tumors within this region of the pancreas are sometimes referred to as pancreatic neuroendocrine tumors (PNETs), and may or may not cause excess amounts of hormones such as insulin. The exocrine component is regarded for making enzymes, useful for metabolism and digestion of food. Exocrine tumors are by far the most common form of pancreatic cancer and can include quite a few specific subtypes.