Key Points for This Section

Avoiding risk factors and increasing protective factors may help prevent liver cancer. The following risk factors may increase the risk of liver cancer: Hepatitis B and C Cirrhosis Aflatoxin The following protective factor may decrease the risk of liver cancer: Hepatitis B vaccine Cancer prevention clinical trials are used to study ways to prevent cancer. New ways to prevent liver cancer are being studied in clinical trials.

Avoiding risk factors and increasing protective factors may help prevent liver cancer.

Anything that increases the chance 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 meant that you will not get cancer. Most people with a certain risk factor for cancer do not usually get the disease. Talk to your doctor or other health care professional about cancer prevention methods that might help you.

The following risk factors may increase the risk of liver cancer:

Hepatitis B and C

Having chronic hepatitis B or chronic hepatitis C increases the risk of developing liver cancer. The risk is even greater for people with both hepatitis B and C. Also, the longer the hepatitis infection lasts (especially hepatitis C), the greater the risk.

Cirrhosis

The risk of developing liver cancer is increased for people who have cirrhosis, a disease in which healthy liver tissue is replaced by scar tissue. The scar tissue blocks the flow of blood through the liver and keeps it from working as it should. Chronic alcoholism and chronic hepatitis C are the most common causes of cirrhosis.

Aflatoxin

The risk of developing liver cancer may be increased by eating foods that contain aflatoxin (poison from a fungus that can grow on foods, such as grains and nuts, that have not been stored properly).

The following protective factor may decrease the risk of liver cancer:

Hepatitis B vaccine

Preventing hepatitis B infection (by being vaccinated for hepatitis B) has been shown to lower the risk of liver cancer in children. It is not yet known if it lowers the risk in adults.

Cancer prevention clinical trials are used to study ways to prevent cancer.

Cancer prevention clinical trials are used to study ways to lower the risk of developing certain types of cancer. Some cancer prevention trials are conducted with healthy people who have not had cancer but who have an increased risk for cancer. Other prevention trials are conducted with people who have had cancer and are trying to prevent another cancer of the same type or to lower their chance of developing a new type of cancer. Other trials are done with healthy volunteers who are not known to have any risk factors for cancer.

The purpose of some cancer prevention clinical trials is to find out whether actions people take can prevent cancer. These may include exercising more or quitting smoking or taking certain medicines, vitamins, minerals, or food supplements.

New ways to prevent liver cancer are being studied in clinical trials.

Clinical trials are taking place in many parts of the country. Information about clinical trials can be found in the Clinical Trials ¹ section of the NCI Web site.

Glossary Terms

A harmful substance made by certain types of mold (Aspergillus flavus and Aspergillus parasiticus) that is often found on poorly stored grains and nuts. Consumption of foods contaminated with aflatoxin is a risk factor for primary liver cancer.

A disease in which a person craves alcohol, is unable to limit his or her drinking, needs to drink greater amounts to get the same effect, and has withdrawal symptoms after stopping alcohol use. Alcoholism affects physical and mental health, and causes problems with family, friends, and work. Also called alcohol dependence.

A tissue with red blood cells, white blood cells, platelets, and other substances suspended in fluid called plasma. Blood takes oxygen and nutrients to the tissues, and carries away wastes.

A term for diseases in which abnormal cells divide without control. Cancer cells can invade nearby tissues and can spread to other parts of the body through the blood and lymph systems. There are several main types of cancer. Carcinoma is cancer that begins in the skin or in tissues that line or cover internal organs. Sarcoma is cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue. Leukemia is cancer that starts in blood-forming tissue such as the bone marrow, and causes large numbers of abnormal blood cells to be produced and enter the blood. Lymphoma and multiple myeloma are cancers that begin in the cells of the immune system. Central nervous system cancers are cancers that begin in the tissues of the brain and spinal cord.

A disease or condition that persists or progresses over a long period of time.

A type of chronic, progressive liver disease in which liver cells are replaced by scar tissue.

A type of research study that tests how well new medical approaches work in people. These studies test new methods of screening, prevention, diagnosis, or treatment of a disease. Also called a clinical study.

A plant-like organism that does not make chlorophyll. Mushrooms, yeasts, and molds are examples. The plural is fungi.

Disease of the liver causing inflammation. Symptoms include an enlarged liver, fever, nausea, vomiting, abdominal pain, and dark urine.

A virus that causes hepatitis (inflammation of the liver). It is carried and passed to others through blood or sexual contact. Also, infants born to infected mothers may become infected with the virus.

A virus that causes hepatitis (inflammation of the liver). It is carried and passed to others through blood or sexual contact. Also, infants born to infected mothers may become infected with the virus.

Invasion and multiplication of germs in the body. Infections can occur in any part of the body and can spread throughout the body. The germs may be bacteria, viruses, yeast, or fungi. They can cause a fever and other problems, depending on where the infection occurs. When the body’s natural defense system is strong, it can often fight the germs and prevent infection. Some cancer treatments can weaken the natural defense system.

A large organ located in the upper abdomen. The liver cleanses the blood and aids in digestion by secreting bile.

Primary liver cancer is cancer that forms in the tissues of the liver. Secondary liver cancer is cancer that spreads to the liver from another part of the body.

Refers to the practices and procedures used for the prevention, treatment, or relief of symptoms of a diseases or abnormal conditions. This term may also refer to a legal drug used for the same purpose.

A nutrient required to maintain health.

NCI, part of the National Institutes of Health of the United States Department of Health and Human Services, is the Federal Government's principal agency for cancer research. It conducts, coordinates, and funds cancer research, training, health information dissemination, and other programs with respect to the cause, diagnosis, prevention, and treatment of cancer. Access the NCI Web site at http://www.cancer.gov. Also called National Cancer Institute.

In medicine, action taken to decrease the chance of getting a disease or condition. For example, cancer prevention includes avoiding risk factors (such as smoking, obesity, lack of exercise, and radiation exposure) and increasing protective factors (such as getting regular physical activity, staying at a healthy weight, and having a healthy diet).

Something that may increase the chance of developing a disease. Some examples of risk factors for cancer include age, a family history of certain cancers, use of tobacco products, certain eating habits, obesity, lack of exercise, exposure to radiation or other cancer-causing agents, and certain genetic changes.

Adding nutrients to the diet.

A group or layer of cells that work together to perform a specific function.

Treated with a vaccine.

A key nutrient that the body needs in small amounts to grow and stay strong. Examples are vitamins A, C, and E.