Malignant mesothelioma is a type of cancer that forms in the thin layer of tissue that covers organs in the chest or abdomen.
Malignant mesothelioma may be found in one or more of the following:
Malignant mesothelioma may also form in the heart or testicles, but this is rare.
Malignant mesothelioma forms in the tissue that lines the chest or abdomen, including the pleura (the tissue that lines the chest cavity and covers the lungs) and the peritoneum (the tissue that lines the abdomen and covers most of the organs in the abdomen). Malignant mesothelioma may also form in the pericardium (the tissue that surrounds the heart) or the testicles, but this is rare.
Being exposed to asbestos can increase the risk of malignant mesothelioma.
Malignant mesothelioma is caused by certain changes to the way the cells that line the organs function, especially how they grow and divide into new cells. Often, the exact cause of the cell change is unknown. Learn more about how cancer develops at
A risk factor is anything that increases the chance of getting a disease. Most people with malignant mesothelioma have worked or lived in places where they inhaled or swallowed asbestos, which has been used in the building and textile industries. After being exposed to asbestos, it usually takes a long time for malignant mesothelioma to form. Living with a person who works near asbestos is also a risk factor for malignant mesothelioma. Not every person with one or more of these risk factors will develop malignant mesothelioma. And it can develop in some people who don't have any known risk factors.
Talk to your doctor if you think you may be at risk.
Signs and symptoms of malignant mesothelioma include shortness of breath and pain under the rib cage.
Sometimes the cancer causes fluid to collect in the chest or in the abdomen. Signs and symptoms may be caused by the fluid, malignant mesothelioma, or other conditions. Check with your doctor if you have any of the following:
Tests that examine the inside of the chest and abdomen are used to diagnose malignant mesothelioma.
Sometimes it is hard to tell the difference between malignant mesothelioma in the chest and lung cancer. If you have symptoms that suggest mesothelioma, the doctor will need to find out if these are due to cancer or to another problem. The doctor will ask when the symptoms started and how often you have been having them. They will also ask about your personal and family health history and do a physical exam. Depending on these results, they may recommend other tests. If you are diagnosed with mesothelioma, the results of these tests will help you and your doctor plan treatment.
The tests and procedures used to diagnose mesothelioma may include:
Procedures used to collect the cells or tissues include:
The following tests may be done on the cells and tissue samples that are taken:
After malignant mesothelioma has been diagnosed, tests are done to find out if cancer cells have spread to other parts of the body.
The process used to find out if cancer has spread outside the pleura or peritoneum is called staging. The information gathered from the staging process determines the stage of the disease. It is important to know whether the cancer has spread in order to plan treatment.
The following tests and procedures may be used in the staging process:
Some people decide to get a second opinion.
You may want to get a second opinion to confirm your cancer diagnosis and treatment plan. If you seek a second opinion, you will need to get medical test results and reports from the first doctor to share with the second doctor. The second doctor will review the pathology report, slides, and scans. They may agree with the first doctor, suggest changes or another treatment approach, or provide more information about your cancer.
Learn more about choosing a doctor and getting a second opinion at
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis and treatment options depend on:
Cancer stage describes the extent of cancer in the body.
Cancer stage describes the extent of cancer in the body, such as the size of the tumor, whether it has spread, and how far it has spread from where it first formed. It is important to know the stage of mesothelioma to plan the best treatment.
There are several staging systems for cancer that describe the extent of the cancer. Malignant mesothelioma staging usually uses the TNM staging system. The cancer may be described by this staging system in your pathology report. Based on the TNM results, a stage (I, II, III, or IV, also written as 1, 2, 3, or 4) is assigned to your cancer. When talking to you about your diagnosis, your doctor may describe the cancer as one of these stages.
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The following stages are used for malignant mesothelioma of the lung:
Stage I (also called stage 1) malignant mesothelioma
Stage I is divided into stages IA and IB:
Stage II (also called stage 2) malignant mesothelioma
In stage II, cancer is found in the inside lining of the chest wall on one side of the chest. On the same side of the chest, cancer may also be found in one or more of the following:
Cancer has spread to lymph nodes along the center of the chest on the same side of the chest as the tumor.
or
Cancer is found in the inside lining of the chest wall, and in each of the thin layers of tissue that cover the lung, the organs between the lungs, and the top of the diaphragm on one side of the chest. On the same side of the chest, cancer has also spread into one or both of the following:
Cancer has spread to lymph nodes along the center of the chest on the same side of the chest as the tumor.
Stage III (also called stage 3) malignant mesothelioma
Stage III is divided into stages IIIA and IIIB.
Cancer has spread to lymph nodes along the center of the chest on the same side of the chest as the tumor.
Cancer has spread to lymph nodes above the collarbone on either side of the chest or cancer has spread to lymph nodes along the center of the chest on the opposite side of the chest as the tumor.
or
Cancer is found in the inside lining of the chest wall, and in each of the thin layers of tissue that cover the lung, the organs between the lungs, and the top of the diaphragm on one side of the chest. Cancer has also spread to one or more of the following:
Cancer may have spread to lymph nodes.
Stage IV (also called stage 4) malignant mesothelioma
In stage IV, cancer has spread to the tissue covering the lung or the lung on the opposite side of the chest, peritoneum, bones, liver, lymph nodes outside the chest, or to other parts of the body.
Stage IV malignant mesothelioma is also called metastatic mesothelioma. Metastatic cancer happens when cancer cells travel through the lymphatic system or blood and form tumors in other parts of the body. The metastatic tumor is the same type of cancer as the primary tumor. For example, if malignant mesothelioma spreads to the liver, the cancer cells in the liver are actually malignant mesothelioma cells. The disease is called metastatic mesothelioma, not liver cancer. Learn more in
Malignant mesothelioma can recur (come back) after it has been treated.
Recurrent malignant mesothelioma is cancer that has come back after it has been treated. If mesothelioma comes back, it may come back in the chest or in other parts of the body, such as the liver, lungs, or both. Tests will be done to help determine where the cancer has returned. The type of treatment for recurrent mesothelioma will depend on where it has come back.
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There are different types of treatment for patients with malignant mesothelioma.
Different types of treatments are available for malignant mesothelioma. You and your cancer care team will work together to decide your treatment plan, which may include more than one type of treatment. Many factors will be considered, such as the stage of the cancer, your overall health, and your preferences. Your plan will include information about your cancer, the goals of treatment, your treatment options and the possible side effects, and the expected length of treatment.
Talking with your cancer care team before treatment begins about what to expect will be helpful. You'll want to learn what you need to do before treatment begins, how you'll feel while going through it, and what kind of help you will need. To learn more, visit
The following types of treatment are used:
Surgery
The following surgical treatments may be used for malignant mesothelioma in the chest:
After the doctor removes all the cancer that can be seen at the time of the surgery, some people may receive chemotherapy or radiation therapy to kill any cancer cells that are left. Treatment given after the surgery, to lower the risk that the cancer will come back, is called adjuvant therapy.
Radiation therapy
Radiation therapy uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. External radiation therapy uses a machine outside the body to send radiation toward the area of the body with cancer. It may also be used as palliative care to relieve symptoms and improve quality of life.
Chemotherapy
Chemotherapy (also called chemo) uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Combination chemotherapy is the use of more than one anticancer drug.
Systemic chemotherapy is when chemotherapy is taken by mouth or injected into a vein or muscle. When given this way, the drugs enter the bloodstream and can reach cancer cells throughout the body.
Regional chemotherapy is when chemotherapy is placed directly into an organ or a body cavity, such as the chest or peritoneum. When given this way, the drugs mainly affect cancer cells in those areas. Hyperthermic intraperitoneal chemotherapy (HIPEC) is a type of regional chemotherapy used to treat malignant mesothelioma:
The way the chemotherapy is given depends on the type and stage of the cancer being treated.
Learn more about how chemotherapy works, how it is given, common side effects, and more at
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Immunotherapy
Immunotherapy helps a person's immune system fight cancer. Your doctor may suggest biomarker tests to help predict your response to certain immunotherapy drugs. Learn more about
Immunotherapy drugs used to treat advanced mesothelioma include:
Other immunotherapy drugs, such as durvalumab, are being studied in malignant mesothelioma.
Learn more about
Targeted therapy
Targeted therapy uses drugs or other substances to identify and attack specific cancer cells. Bevacizumab is a targeted therapy drug used to treat malignant mesothelioma.
Other targeted therapies, such as ramucirumab, are being studied in malignant mesothelioma.
Learn more about
New types of treatment are being tested in clinical trials.
Joining a clinical trial may be an option. There are different types of clinical trials for people with mesothelioma. For example, a treatment trial tests new treatments or new ways of using existing treatments. Supportive care and palliative care trials look at ways to improve quality of life, especially for those who have side effects from cancer and its treatment.
You can use the
Learn more about clinical trials at
Treatment for malignant mesothelioma may cause side effects.
For information about side effects caused by treatment for cancer, visit our
Follow-up care may be needed.
As you go through treatment, you will have follow-up tests or check-ups. Some tests that were done to diagnose or stage the cancer may be repeated to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back).
If stage I malignant mesothelioma is in one part of the chest lining, treatment may include surgery to remove the cancer and the tissue around it.
Treatment of stage I intracavitary mesothelioma may include:
Learn more about these treatments in the
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If stage II, stage III, or stage IV malignant mesothelioma is found in the chest, treatment may include:
If stage II, stage III, or stage IV malignant mesothelioma is found in the peritoneum, treatment may include:
Learn more about these treatments in the
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When malignant mesothelioma recurs (comes back), the treatment strategy often involves options that weren't used in the initial treatment. If you haven't received systemic therapy before, treatment may include:
If you have received systemic therapy, treatment might include the following, given alone or in combination:
For certain people with locally recurrent cancer, surgery to remove the affected part of the chest wall may be an option.
Learn more about these treatments in the
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For more from the National Cancer Institute about malignant mesothelioma, see the following:
For general cancer information and other resources from the National Cancer Institute, visit:
About PDQ
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Clinical trials can be found online at
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Last Revised: 2024-07-19
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