About Pancreatic Cancer
Pancreatic cancer occurs when normal cells of the pancreas grow out of control within the pancreas. The pancreas is an organ located just behind the stomach. Its two main functions are to produce insulin in just the right amount to maintain constant glucose, or sugar, levels in the body and to produce enzymes to promote food digestion.
There are several types of pancreatic cancer. They are named for the cell type within the pancreas that started the cancer.
- Adenocarcinoma of the pancreas
This is the most common, accounting for more than 80 percent of all pancreatic cancer. This type starts from cells lining the main or accessory duct of the pancreas.
- Adenocarcinoma of the ampulla
This is another common type. It starts from cells lining the approach to the ampulla where the bile duct and the pancreatic duct join the small intestine.
- Intraductal papillay mucinous neoplasm
A growing number of people are being diagnosed with IPMN, which starts from pancreatic duct cells that produce mucin. These are important because while some IPMNs are already cancerous when diagnosed, most have not yet become malignant. If left untreated, IPMNs may progress to pancreatic cancer. If surgically removed at an early stage, more than 95 percent of patients will be cured.
- Islet cell neoplasms of the pancreas
Islet cells make and release different kinds of hormones (such as gastrin, insulin and glucagon) into the blood. There are three major types of islet cell neoplasms of the pancreas and several more rare types of these tumors. Islet cell tumors may be functional (the hormones that are released cause symptoms) or nonfunctional (the hormones that are released do not cause symptoms) tumors.
The exact causes of pancreatic cancer are unknown, but multiple risk factors are associated with the diagnosis. According to the National Cancer Institute, they include:
- Age - Most pancreatic cancer occurs in people over 60.
- Smoking - Heavy cigarette smokers are two or three times more likely than nonsmokers to develop pancreatic cancer.
- Diabetes - Pancreatic cancer occurs more often in people who have diabetes. New-onset diabetes can also be a symptom of pancreatic cancer.
- Gender - Slightly more men than women are diagnosed with pancreatic cancer.
- Race - African-Americans and Ashkenazi Jews are more likely than Asians, Hispanics or Caucasians to be diagnosed with pancreatic cancer.
- Chronic pancreatitis - This condition of the pancreas has been linked with a ninefold increased risk for pancreatic cancer.
- Family history - The risk for developing pancreatic cancer triples if a person's mother, father or sibling had the disease. High-risk groups include individuals who are positive for BRCA1, BRCA2 and several other genetic syndromes. Medical geneticists at OHSU can help you determine your familial risk for pancreatic cancer.