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What Causes Liver Cancer?
A risk factor is anything that affects a person's chance of getting a disease. Different cancers have different risk factors. Some risk factors, such as smoking, can be controlled. Others, like a person's age or family history, can't be changed. But having a risk factor, or even many, does not mean that a person will develop cancer.
Risk Factors
Scientists have found many risk factors that make a person more likely to get hepatocellular liver cancer.
Gender
Men are more likely to get liver cancer than are women. This could be because of the behaviors listed below, such as smoking and alcohol abuse.
Certain Types of Liver Disease
On-going (chronic) infection with hepatitis B virus (HBV) or hepatitis C virus (HCV) is a very important liver cancer risk factor. These infections are common in many parts of the world. In this country, hepatitis C is the most common cause of liver cancer, while in other countries, hepatitis B is more common. These viruses are spread from person to person through sharing dirty needles (such as in drug use), unprotected sex, or childbirth. They can also be passed on through blood transfusions. This is rare in the United States because blood products are now tested for these viruses. People with hepatitis A infection do not have an increased risk of liver cancer.
There are also some inherited liver diseases that increase the risk of liver cancer.
Cirrhosis
Cirrhosis (suh-row-sis) is a disease in which liver cells are damaged and replaced with scar tissue. This can often lead to cancer. In this country, the major causes of liver cirrhosis are alcohol abuse and hepatitis B and C. Another cause is a disease that results in too much iron in the liver.
Diabetes
can increase the risk of liver cancer. This is more common in diabetics who have other risk factors such as heavy drinking or viral hepatitis.
Obesity
Obesity might increase the risk of getting liver cancer.
Aflatoxins
These cancer-causing substances are made by a fungus that can contaminate peanuts, wheat, soybeans, groundnuts, corn, and rice. Long-term exposure to aflatoxins can increase the risk of liver cancer. In the United States and Europe, these foods are tested for aflatoxins.
Vinyl Chloride and Thorium Dioxide (Thorotrast)
These chemicals are risk factors for several types of liver cancer. They have become much less important since Thorotrast is no longer used and exposure to vinyl chloride is strictly controlled.
Anabolic Steroids
These male hormones are used by some athletes to increase their strength. Long-term use of these can slightly increase the risk of liver cancer.
Arsenic
In some parts of the world, drinking water contaminated with arsenic increases the risk of liver cancer. This is a concern in some areas of the United States.
Less Certain Risk Factors for Liver Cancer
Birth Control Pills
Birth control pills may slightly increase the risk of liver cancer. Most of the studies linking birth control pills and cancer involve types of pills that are no longer used. Birth control pills are now made in a different way, and it is not known if they increase liver cancer risk.
Tobacco
Some studies have found a link between smoking and liver cancer, but the extent of this is not known.
A risk factor is anything that affects a person's chance of getting a disease. Different cancers have different risk factors. Some risk factors, such as smoking, can be controlled. Others, like a person's age or family history, can't be changed. But having a risk factor, or even many, does not mean that a person will develop cancer.
Risk Factors
Scientists have found many risk factors that make a person more likely to get hepatocellular liver cancer.
Gender
Men are more likely to get liver cancer than are women. This could be because of the behaviors listed below, such as smoking and alcohol abuse.
Certain Types of Liver Disease
On-going (chronic) infection with hepatitis B virus (HBV) or hepatitis C virus (HCV) is a very important liver cancer risk factor. These infections are common in many parts of the world. In this country, hepatitis C is the most common cause of liver cancer, while in other countries, hepatitis B is more common. These viruses are spread from person to person through sharing dirty needles (such as in drug use), unprotected sex, or childbirth. They can also be passed on through blood transfusions. This is rare in the United States because blood products are now tested for these viruses. People with hepatitis A infection do not have an increased risk of liver cancer.
There are also some inherited liver diseases that increase the risk of liver cancer.
Cirrhosis
Cirrhosis (suh-row-sis) is a disease in which liver cells are damaged and replaced with scar tissue. This can often lead to cancer. In this country, the major causes of liver cirrhosis are alcohol abuse and hepatitis B and C. Another cause is a disease that results in too much iron in the liver.
Diabetes
can increase the risk of liver cancer. This is more common in diabetics who have other risk factors such as heavy drinking or viral hepatitis.
Obesity
Obesity might increase the risk of getting liver cancer.
Aflatoxins
These cancer-causing substances are made by a fungus that can contaminate peanuts, wheat, soybeans, groundnuts, corn, and rice. Long-term exposure to aflatoxins can increase the risk of liver cancer. In the United States and Europe, these foods are tested for aflatoxins.
Vinyl Chloride and Thorium Dioxide (Thorotrast)
These chemicals are risk factors for several types of liver cancer. They have become much less important since Thorotrast is no longer used and exposure to vinyl chloride is strictly controlled.
Anabolic Steroids
These male hormones are used by some athletes to increase their strength. Long-term use of these can slightly increase the risk of liver cancer.
Arsenic
In some parts of the world, drinking water contaminated with arsenic increases the risk of liver cancer. This is a concern in some areas of the United States.
Less Certain Risk Factors for Liver Cancer
Birth Control Pills
Birth control pills may slightly increase the risk of liver cancer. Most of the studies linking birth control pills and cancer involve types of pills that are no longer used. Birth control pills are now made in a different way, and it is not known if they increase liver cancer risk.
Tobacco
Some studies have found a link between smoking and liver cancer, but the extent of this is not known.
