Pancreatic cancer occurs when the cells of the pancreas, the abdominal organs, begin to proliferate uncontrollably and form large quantities. These cancerous cells have the capacity to attack other parts of the body. There are many types of pancreatic cancer. The most common adenocarcinoma, pancreatic adenocarcinoma, is around 90 percent, and the term "pancreatic cancer" is sometimes used to refer to that type alone. These adenocarcinomas originate in the pancreas that make digestive enzymes. Many other types of cancer, collectively representing the majority of non-adenocarcinomas, can also originate from these cells. One to two percent of pancreatic cancer is neuroendocrine tumors, which come from the pancreas-producing cells. This is usually less effective than pancreatic adenocarcinoma. Symptoms and symptoms of the most common forms of pancreatic cancer can include yellow skin, abdominal or back pain, unexplained weight loss, light-colored chairs, dark urine, and loss of appetite.