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Pancreatic cancer is classified into two main types: those that form in the exocrine gland and those that form in the endocrine gland. About 95 percent of pancreatic cancers begin in the exocrine (enzyme-producing) cells of the pancreas.
Exocrine tumors: Most of the pancreas is made of exocrine cells, and most tumors affecting these cells are called adenocarcinomas. Found in many other cancers, including breast, prostate and lung, adenocarcinomas most often form in glands that secrete fluids. Pancreatic adenocarcinomas most often form in the exocrine cells found in pancreas ducts. Treatment for adenocarcinomas of the pancreas is based on the stage and size of the tumor.
Endocrine tumors: These tumors are less common and are most often benign. Though rare, cancer stemming from a pancreatic endocrine tumor (PET) affects the hormone-producing cells. These tumors are also called islet cell tumors or neuroendocrine tumors.
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