Pancreatic cancer starts when cells in the pancreas start to grow out of control. The pancreas is an organ that sits behind the stomach. It’s shaped a bit like a fish with a wide head, a tapering body, and a narrow, pointed tail. In adults it’s about 6 inches long but less than 2 inches wide. The head of the pancreas is on the right side of the abdomen (belly), behind where the stomach meets the duodenum (the first part of the small intestine). The body of the pancreas is behind the stomach, and the tail of the pancreas is on the left side of the abdomen next to the spleen.
Pancreatic cancer is hard to find early. The pancreas is deep inside the body, so early tumors can’t be seen or felt by health care providers during routine physical exams. People usually have no symptoms until the cancer has already spread to other organs.
Screening tests or exams are used to look for a disease in people who have no symptoms (and who have not had that disease before). At this time, no major professional groups recommend routine screening for pancreatic cancer in people who are at average risk. This is because no screening test has been shown to lower the risk of dying from this cancer.
Sometimes when a person has pancreatic cancer, the levels of certain proteins in the blood go up. These proteins, called tumor markers, can be detected with blood tests. The tumor markers CA 19-9 and carcinoembryonic antigen (CEA) are the ones most closely tied to pancreatic cancer. But these proteins don’t always go up when a person has pancreatic cancer, and even if they do, the cancer is often already advanced by the time this happens. Sometimes levels of these tumor markers can go up even when a person doesn’t have pancreatic cancer. For these reasons, blood tests aren’t used to screen for pancreatic cancer, although a doctor might still order these tests if a person has symptoms that might be from pancreatic cancer. These tests are more often used in people already diagnosed with pancreatic cancer to help tell if treatment is working or if the cancer is progressing.
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