Pancreatic ductal adenocarcinoma (PDAC) may be a sort of exocrine carcinoma. It is the foremost common sort of carcinoma – 95 out of 100 (95%) of all pancreatic cancers are PDAC. PDAC develops from cells lining small tubes within the pancreas called ducts (duct cells within the diagram above). These carry the digestive juices, which contain enzymes, into the most duct then on into the duodenum (first a part of the tiny intestine). PDAC can grow anywhere within the pancreas, though it's most frequently found within the head of the pancreas. Symptoms can include tummy (abdominal) and back pain, weight loss, and changes to bowel habits. Read more about the symptoms of PDAC.