A tumor arising from the epithelial tissue of the pancreas is called pancreatic cancer, but the pancreas is an organ that is composed of several tissues. In fact, there are alveolar cells, bile duct cells, and neuroendocrine cells in the middle of the pancreas. All tumors of epithelial tissue origin are called pancreatic cancer, which is a general term for tumors of epithelial tissue origin in the pancreas. Generally speaking, pancreatic cancer is often referred to as pancreatic ductal cell carcinoma. Patients with pancreatic ductal carcinoma mainly present with clinical symptoms such as nausea, vomiting, abdominal pain, poor appetite, emaciation, and weakness.