Gallbladder Cancer Risk Factors
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What Are the Risk Factors for Gallbladder Cancer?
Although the exact causes of gallbladder cancer are unknown, certain factors may increase a person’s risk of developing gallbladder cancer. Frequently, these factors are related to chronic inflammation of the gallbladder. However, it is important to remember that having one or more gallbladder cancer risk factor does not guarantee a person will develop the disease.
Factors that may increase a person’s gallbladder cancer risks include:
- Gallstones – The leading gallbladder cancer risk factor is the presence of gallstones, which are found in over 75 percent of patients with gallbladder cancer. These hard, rock-like deposits can form from cholesterol and other substances found in the bile. Gallstones can block the flow of bile, and lead to chronic inflammation. However, gallstones are very common, particularly in middle-aged women, and most people with this condition do not develop gallbladder cancer.
- Female Gender – Gallbladder cancer occurs twice as frequently in women as in men, and this may be related to the increased frequency of gallstones and chronic inflammation.
- Obesity – Being overweight or obese is a risk factor for gallbladder cancer, and may be related to the increased risk for developing gallstones.
- Older Age – Gallbladder cancer occurs mainly in individuals over the age of 65, and the average age at diagnosis is 73.
- Ethnicity and Geography – Gallbladder cancer occurs more frequently in Mexican Americans and Native Americans, while African Americans are at the lowest risk. However, gallbladder cancer is less common in the United States compared with countries in Asia, Eastern Europe and South America.
- Porcelain Gallbladder - This is a condition where calcium deposits cover the wall of the gallbladder, and some but not all studies have suggested a link between this condition and the development of gallbladder cancer. There may be a link between chronic inflammation and the calcification of the gallbladder.
- Choledochal Cysts - Bile-filled cysts may develop along the common bile duct that leads from the gallbladder and liver to the small intestine. Sometimes the lining of the cysts may develop pre-cancerous cells, increasing the risk of cancer.
- Bile Duct Abnormalities - Other conditions that cause the bile duct to backup or result in inflammation of the gallbladder may also be potential risk factors.
- Gallbladder Polyps – These are abnormal growths that form on the gallbladder. They may be caused by cholesterol deposits or by inflammation. Larger polyps (bigger than a centimeter) have a greater chance of being cancerous, and doctors often recommend removing the gallbladder when larger polyps are found.
- Chemical Exposure - Some studies have shown that exposure to certain industrial chemicals, particularly those used in the rubber and textile industries, may be linked to an increased risk of gallbladder cancer. However, the link is not certain, and more research is needed.
- Typhoid – Individuals with a chronic salmonella infection, which is the bacterium that causes typhoid, may be at increased risk for gallbladder cancer, but this is rare in the United States.
- Family History – Although the genetic cause is unknown, the risk of gallbladder cancer seems to increase in families with a history of the disease.
NOTE: Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer. Not having risk factors doesn’t mean that you will not get cancer. If you think you may be at risk, you should discuss it with your doctor.
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