Types of pancreatic cancer. There are two types of pancreatic cancer, that of the exocrine gland and that of the endocrine gland. About 95 percent of pancreatic cancers begin in the exocrine (enzyme-producing) cells of the pancreas. 1  Exocrine tumors: Most tumors affecting the exocrine gland are called adenocarcinomas. 2  This type of cancer forms in the pancreas ducts.