Cancer that begins in the liver
is called primary liver cancer and is not common in the West. However, it
is common for cancer to spread to the liver from the colon, lungs, breasts,
or other parts of the body. When this happens, the disease is not liver
cancer. The cancer in the liver is a secondary cancer. It is named for the
organ or the tissue in which it began.
Most primary liver cancers begin in hepatocytes (liver cells). This type
of cancer is called hepatocellular carcinoma or malignant hepatoma.
Children may develop childhood hepatocellular carcinoma or hepatoblastoma.
This article does not deal with childhood liver cancer.
When liver cancer spreads (metastasizes) outside the liver, the cancer cells
tend to spread to nearby lymph nodes
and to the bones and lungs.
When this happens, the new tumor has the same
kind of abnormal cells as the primary tumor in the liver. For example, if
liver cancer spreads to the bones, the cancer cells in the bones are actually
liver cancer cells. The disease is metastatic liver cancer, not bone
cancer. It is treated as liver cancer, not bone cancer.
Similarly, cancer that spreads to the liver from another part of the body
is different from primary liver cancer. The cancer cells in the liver are
like the cells in the original tumor. When cancer cells spread to the liver
from another organ (such as the colon, lung, or breast), doctors may call
the tumor in the liver a secondary tumor. In the United States, secondary
tumors in the liver are far more common than primary tumors.
The liver is the largest organ in the body.
It is found behind the rib-cage on the
right side of the abdomen. The liver has
two parts, a right lobe and a smaller left lobe.
The liver has many important functions that keep a person healthy. It removes
harmful material from the blood. It makes
enzymes and bile
that help digest food. It also converts food into substances needed for
life and growth.
The liver gets its supply of blood from two vessels. Most of its blood comes
from the hepatic portal vein. The rest comes from the hepatic
|The liver and nearby organs
Who is at risk from lung cancer?
Researchers in hospitals and medical centers around the world are working
to learn more about what causes liver cancer. At this time, no one knows
its exact causes. However, scientists have found that people with certain
risk factors are more likely than others to develop liver cancer. A risk
factor is anything that increases a person's chance of developing a disease.
Studies have shown the following risk factors:
The more risk factors a person has, the greater the chance that liver cancer
will develop. However, many people with known risk factors for liver cancer
do not develop the disease. People who think they may be at risk for liver
cancer should discuss this concern with their doctor. The doctor may plan
a schedule for checkups.
- Chronic liver infection (hepatitis).
Certain viruses can infect the liver. The infection may be chronic.
(It may not go away.) The most important risk factor for liver cancer
is a chronic infection with the hepatitis B virus or the hepatitis C
virus. These viruses can be passed from person to person through blood
(such as by sharing needles) or sexual contact. An infant may catch
these viruses from an infected mother. Liver cancer can develop after
many years of infection with the virus.
These infections may not cause symptoms, but blood tests can show whether
either virus is present. If so, the doctor may suggest treatment. Also,
the doctor may discuss ways of avoiding infecting other people.
In people who are not already infected with hepatitis B virus, hepatitis
B vaccine can prevent chronic hepatitis B infection and can protect
against liver cancer. Researchers are now working to develop a vaccine
to prevent hepatitis C infection.
Cirrhosis is a disease that develops when liver cells are damaged and
replaced with scar tissue. Cirrhosis may be caused by alcohol abuse,
certain drugs and other chemicals, and certain viruses or parasites.
About 5 percent of people with cirrhosis develop liver cancer.
- Aflatoxin. Liver cancer can be caused by aflatoxin,
a harmful substance made by certain types of mold. Aflatoxin can form
on peanuts, corn, and other nuts and grains. In Asia and Africa, aflatoxin
contamination is a problem. However, the U.S. Food and Drug Administration
(FDA) does not allow the sale of foods that have high levels of aflatoxin.
- Being male. Men are twice as likely as women to get
- Family history. People who have family members with
liver cancer may be more likely to get the disease.
- Age. In the United States, liver cancer occurs more
often in people over age 60 than in younger people.
What are the signs and symptoms
of liver cancer?
Liver cancer is sometimes called a silent disease because in an early stage
it often does not cause symptoms. But, as the cancer grows, symptoms may
These symptoms are not sure signs of liver cancer. Other liver diseases
and other health problems can also cause these symptoms. Anyone with these
symptoms should see a doctor as soon as possible. Only a doctor can diagnose
and treat the problem.
- Pain in the upper abdomen on the right side; the pain may extend to
the back and shoulder
- Swollen abdomen (bloating)
- Weight loss
- Loss of appetite and feelings of fullness
- Weakness or feeling very tired
- Nausea and vomiting
- Yellow skin and eyes, and dark urine from jaundice
liver cancer diagnosed?
If a patient has symptoms that suggest liver cancer, the doctor performs
one or more of the following procedures:
- Physical exam. The doctor feels the abdomen to check
the liver, spleen, and nearby organs for any lumps or changes in their
shape or size. The doctor also checks for ascites, an abnormal buildup
of fluid in the abdomen. The doctor may examine the skin and eyes for
signs of jaundice.
- Blood tests.
Many blood tests may be used to check for liver problems. One blood
test detects alpha-fetoprotein (AFP). High AFP levels could be a sign
of liver cancer. Other blood tests can show how well the liver is working.
- CT scan.
An X-ray machine linked to a computer takes a series of detailed pictures
of the liver and other organs and blood vessels in the abdomen. The
patient may receive an injection of a special dye so the liver shows
up clearly in the pictures. From the CT scan, the doctor may see tumors
in the liver or elsewhere in the abdomen.
- Ultrasound test.
The ultrasound device uses sound waves that cannot be heard by humans.
The sound waves produce a pattern of echoes as they bounce off internal
organs. The echoes create a picture (sonogram) of the liver and other
organs in the abdomen. Tumors may produce echoes that are different
from the echoes made by healthy tissues.
- Magnetic resonance
imaging (MRI). A powerful magnet linked to a computer is
used to make detailed pictures of areas inside the body. These pictures
are viewed on a monitor and can also be printed.
- Angiogram. For an angiogram, the patient may be in
the hospital and may have anesthesia.
The doctor injects dye into an artery so that the blood vessels in the
liver show up on an X-ray. The angiogram can reveal a tumor in the liver.
- Biopsy. In some cases,
the doctor may remove a sample of tissue. A pathologist uses a microscope
to look for cancer cells in the tissue. The doctor may obtain tissue
in several ways. One way is by inserting a thin needle into the liver
to remove a small amount of tissue. This is called fine-needle aspiration.
The doctor may use CT or ultrasound to guide the needle. Sometimes the
doctor obtains a sample of tissue with a thick needle (core biopsy)
or by inserting a thin, lighted tube (laparoscope) into a small incision
in the abdomen. Another way is to remove tissue during an operation.
Staging the disease
If liver cancer is diagnosed, the doctor needs to know the stage, or extent,
of the disease to plan the best treatment. Staging is an attempt to find
out the size of the tumor, whether the disease has spread, and if so, to
what parts of the body. Careful staging shows whether the tumor can be removed
with surgery. This is very important because most liver cancers cannot be
removed with surgery.
The doctor may determine the stage of liver cancer at the time of diagnosis,
or the patient may need more tests. These tests may include imaging tests,
such as a CT scan, MRI, angiogram, or ultrasound. Imaging tests can help
the doctor find out whether the liver cancer has spread. The doctor also
may use a laparoscope to look directly at the liver and nearby organs.
How is liver cancer treated?
Read about how liver cancer is
Source: National Cancer