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Cancer is when cells in the body change and grow out of control. Your body is made up of tiny building blocks called cells. Normal cells grow when your body needs them, and die when your body does not need them any longer.
Cancer is made up of abnormal cells that grow even though your body doesn't need them. In most cancers, the abnormal cells grow to form a lump or mass called a tumor. If cancer cells are in the body long enough, they can grow into (invade) nearby areas. They can even spread to other parts of the body (metastasis).
Liver cancer is cancer that starts in your liver. This is also called primary liver cancer. Primary liver cancer is not the same as cancer that started somewhere else in the body and then has spread (metastasized) to the liver. Cancer that starts in another organ, such as the colon, breast, or lung, and then spreads to the liver is called secondary liver cancer. Secondary liver cancer is more common in the United States than primary liver cancer. Cancer that has spread to the liver from somewhere else is treated like the original cancer. For instance, lung cancer that has spread to the liver is treated like lung cancer.
The liver is a large, pyramid-shaped organ that lies behind the ribs on the right side of the body. It’s under the right lung. It is divided into right and left lobes.
The liver helps break down nutrients. These include sugars, starch, fats, and proteins. It also stores some of these. The liver also makes proteins, such as albumin. This helps the body balance fluids. It also makes clotting factors, which help blood thicken or clot when a person is bleeding. Bile made in the liver is important for digesting food and for other bodily functions.
One of the liver’s most important jobs is to filter out and destroy toxins in the body. When the liver isn’t working well, chemicals can build up inside the body and cause damage.
The main types of primary liver cancer include:
Hepatocellular carcinoma. This is the most common liver cancer. It’s also called hepatoma. About four out of every five primary liver cancers are of this type. This type of cancer starts in the main liver cells called hepatocytes.
Intrahepatic cholangiocarcinoma. About 10–20% of all liver cancers are cholangiocarcinomas. These cancers start in the bile ducts. These are small tubes where bile leaves the liver and goes into the gallbladder and intestines during digestion. This type of cancer can also start in the bile ducts outside the liver.
Hepatoblastoma. This is a rare liver cancer often found in children.
Angiosarcoma. This is another uncommon form of liver cancer. It starts in blood vessels inside the liver.
Several types of non-cancerous (benign) tumors can also form in the liver. These include hemangiomas, hepatic adenomas, and focal nodular hyperplasia. These tumors don’t spread to other parts of the body. But they can still cause problems if they grow large enough.
If you have questions about liver cancer, talk with your healthcare provider. Your healthcare provider can help you understand more about this cancer.
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