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Pheochromocytoma & Paraganglioma Treatment

Pheochromocytoma & Paraganglioma Treatment

Access exceptional care for pheochromocytoma (a type of adrenal gland tumor) and paraganglioma (a tumor near adrenal gland blood vessels and nerves) at Montefiore Einstein Comprehensive Cancer Center. As one of the first NCI-designated cancer centers, for more than 50 years, we’ve been a leader in the research, diagnosis and treatment of over 200 types of cancer.  

Expect accurate, timely answers so you can make informed choices about your health. Your care team will recommend diagnostic tests to determine if your tumor is benign (noncancerous) or malignant (cancerous) and make recommendations for the next steps personalized to your health needs.

If your tumor is cancerous, place your trust in the hands of some of the country’s best specialists. Montefiore Einstein Comprehensive Cancer Center is home to the first endocrine and neuroendocrine tumor program in the New York region and one of only a few programs in the country. You’ll receive advanced, comprehensive care from a multidisciplinary team dedicated to caring for patients like you.

If you need adrenal gland removal surgery, your procedure may be performed laparoscopically. This means that your surgeon uses advanced technology and minimally invasive techniques, so you have a faster recovery with less risk of complications than traditional surgery.

You also benefit from our ongoing research into new, innovative treatments, some of which can be included in your care before they’re widely available if you choose to participate in one of our leading-edge cancer clinical trials.

When you need pheochromocytoma and paraganglioma care, turn to our providers who are passionate about ending cancer and addressing your whole health needs.

As an NCI-designated comprehensive cancer center, Montefiore Einstein Comprehensive Cancer Center supports the mission and guidelines of the National Cancer Institute (NCI). The following information about types of cancer, prevention and treatments is provided by the NCI.

Pheochromocytoma and Paraganglioma Treatment (PDQ®)–Patient Version

General Information About Pheochromocytoma and Paraganglioma

Key Points

  • Pheochromocytoma and paraganglioma are rare tumors that come from the same type of tissue.
  • Pheochromocytoma is a rare tumor that forms in the adrenal medulla (the center of the adrenal gland).
  • Paragangliomas form outside the adrenal gland.
  • Some inherited disorders and changes in certain genes increase the risk of pheochromocytoma or paraganglioma.
  • Signs and symptoms of pheochromocytoma and paraganglioma include high blood pressure and headache.
  • Signs and symptoms of pheochromocytoma and paraganglioma may occur at any time or be brought on by certain events.
  • Tests that examine the blood and urine are used to diagnose pheochromocytoma and paraganglioma.
  • Genetic counseling is part of the treatment plan for patients with pheochromocytoma or paraganglioma.
  • Certain factors affect prognosis (chance of recovery) and treatment options.

Pheochromocytoma and paraganglioma are rare tumors that come from the same type of tissue.

Paragangliomas form in nerve tissue in the adrenal glands and near certain blood vessels and nerves. Paragangliomas that form in the adrenal glands are called pheochromocytomas. Paragangliomas that form outside the adrenal glands are called extra-adrenal paragangliomas. In this summary, extra-adrenal paragangliomas are called paragangliomas.

Pheochromocytomas and paragangliomas may be benign (not cancer) or malignant (cancer).

Pheochromocytoma is a rare tumor that forms in the adrenal medulla (the center of the adrenal gland).

Pheochromocytoma forms in the adrenal glands. There are two adrenal glands, one on top of each kidney in the back of the upper abdomen. Each adrenal gland has two parts. The outer layer of the adrenal gland is the adrenal cortex. The center of the adrenal gland is the adrenal medulla.

Pheochromocytoma is a rare tumor of the adrenal medulla. Usually, pheochromocytoma affects one adrenal gland, but it may affect both adrenal glands. Sometimes there is more than one tumor in one adrenal gland.

The adrenal glands make important hormones called catecholamines. Adrenaline (epinephrine) and noradrenaline (norepinephrine) are two types of catecholamines that help control heart rate, blood pressure, blood sugar, and the way the body reacts to stress. Sometimes a pheochromocytoma will release extra adrenaline and noradrenaline into the blood and cause signs or symptoms of disease.

Anatomy of the adrenal gland; drawing of the abdomen showing the left and right adrenal glands, the left and right kidneys, and major blood vessels. Also shown is an inset of an adrenal gland showing the adrenal cortex and the adrenal medulla.

Anatomy of the adrenal gland. There are two adrenal glands, one on top of each kidney. The outer part of each gland is the adrenal cortex and the inner part is the adrenal medulla.

Paragangliomas form outside the adrenal gland.

Paragangliomas are rare tumors that form near the carotid artery, along nerve pathways in the head and neck, and in other parts of the body. Some paragangliomas make extra catecholamines called adrenaline and noradrenaline. The release of these extra catecholamines into the blood may cause signs or symptoms of disease.

Paraganglioma of the head and neck; drawing shows a tumor near the carotid artery in the head and neck.

Paraganglioma of the head and neck. A rare tumor that often forms near the carotid artery. It may also form along nerve pathways in the head and neck and in other parts of the body.

Some inherited disorders and changes in certain genes increase the risk of pheochromocytoma or paraganglioma.

Anything that increases your chance of getting a disease is called a risk factor. Having a risk factor doesn't mean that you will get cancer; not having risk factors doesn’t mean that you will not get cancer. Talk to your doctor if you think you may be at risk.

The following inherited syndromes or gene changes increase the risk of pheochromocytoma or paraganglioma:

Signs and symptoms of pheochromocytoma and paraganglioma include high blood pressure and headache.

Some tumors do not make extra adrenaline or noradrenaline and do not cause signs and symptoms. These tumors are sometimes found when a lump forms in the neck or when a test or procedure is done for another reason. Signs and symptoms of pheochromocytoma and paraganglioma occur when too much adrenaline or noradrenaline is released into the blood. These and other signs and symptoms may be caused by pheochromocytoma and paraganglioma or by other conditions. Check with your doctor if you have any of the following:

  • High blood pressure.
  • Headache.
  • Heavy sweating for no known reason.
  • A strong, fast, or irregular heartbeat.
  • Being shaky.
  • Being extremely pale.

The most common sign is high blood pressure that may be hard to control. Very high blood pressure can cause serious health problems such as irregular heartbeat, heart attack, stroke, or death.

Signs and symptoms of pheochromocytoma and paraganglioma may occur at any time or be brought on by certain events.

Signs and symptoms of pheochromocytoma and paraganglioma may occur when one of the following events happens:

  • Hard physical activity.
  • A physical injury or having a lot of emotional stress.
  • Childbirth.
  • Going under anesthesia.
  • Surgery, including procedures to remove the tumor.
  • Eating foods high in tyramine (such as red wine, chocolate, and cheese).

Tests that examine the blood and urine are used to diagnose pheochromocytoma and paraganglioma.

The following tests and procedures may be used:

  • Physical exam and health history: An exam of the body to check general signs of health, including checking for signs of disease, such as high blood pressure or anything else that seems unusual. A history of the patient’s health habits, diet, and past illnesses and treatments will also be taken.
  • Twenty-four-hour urine test: A test in which urine is collected for 24 hours to measure the amounts of catecholamines in the urine. Substances caused by the breakdown of these catecholamines are also measured. An unusual (higher or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it. Higher-than-normal amounts of certain catecholamines may be a sign of pheochromocytoma.
  • Blood catecholamine studies: A procedure in which a blood sample is checked to measure the amount of certain catecholamines released into the blood. Substances caused by the breakdown of these catecholamines are also measured. An unusual (higher than or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it. Higher-than-normal amounts of certain catecholamines may be a sign of pheochromocytoma.
  • CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the neck, chest, abdomen, and pelvis, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.
  • MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body such as the neck, chest, abdomen, and pelvis. This procedure is also called nuclear magnetic resonance imaging (NMRI).

Genetic counseling is part of the treatment plan for patients with pheochromocytoma or paraganglioma.

All patients who are diagnosed with pheochromocytoma or paraganglioma should have genetic counseling to find out their risk for having an inherited syndrome and other related cancers.

Genetic testing may be recommended by a genetic counselor for patients who:

  • Have a personal or family history of traits linked with inherited pheochromocytoma or paraganglioma syndrome.
  • Have tumors in both adrenal glands.
  • Have more than one tumor in one adrenal gland.
  • Have signs or symptoms of extra catecholamines being released into the blood or malignant (cancerous) paraganglioma.
  • Are diagnosed before age 40.

Genetic testing is sometimes recommended for patients with pheochromocytoma who:

  • Are aged 40 to 50 years.
  • Have a tumor in one adrenal gland.
  • Do not have a personal or family history of an inherited syndrome.

When certain gene changes are found during genetic testing, the testing is usually offered to family members who are at risk but do not have signs or symptoms.

Genetic testing is not recommended for patients older than 50 years.

Certain factors affect prognosis (chance of recovery) and treatment options.

The prognosis and treatment options depend on the following:

  • Whether the tumor is benign or malignant.
  • Whether the tumor is in one area only or has spread to other places in the body.
  • Whether there are signs or symptoms caused by a higher-than-normal amount of catecholamines.
  • Whether the tumor has just been diagnosed or has recurred (come back).

Stages of Pheochromocytoma and Paraganglioma

Key Points

  • After pheochromocytoma and paraganglioma have been diagnosed, tests are done to find out if the tumor has spread to other parts of the body.
  • There are three ways that cancer spreads in the body.
  • Cancer may spread from where it began to other parts of the body.
  • Pheochromocytoma and paraganglioma are described as localized, regional, or metastatic.
    • Localized pheochromocytoma and paraganglioma
    • Regional pheochromocytoma and paraganglioma
    • Metastatic pheochromocytoma and paraganglioma
    • Pheochromocytoma and paraganglioma can recur (come back) after they have been treated.

After pheochromocytoma and paraganglioma have been diagnosed, tests are done to find out if the tumor has spread to other parts of the body.

The process to find out if cancer has spread to other parts of the body is usually called staging. It is important to know whether the cancer has spread in order to plan treatment. The following tests and procedures may be used to determine if the tumor has spread to other parts of the body:

  • CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the neck, chest, abdomen, and pelvis, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. The abdomen and pelvis are imaged to detect tumors that release catecholamine. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.
  • MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body such as the neck, chest, abdomen, and pelvis. This procedure is also called nuclear magnetic resonance imaging (NMRI).
  • MIBG scan: A procedure used to find neuroendocrine tumors, such as pheochromocytoma and paraganglioma. A very small amount of a substance called radioactive MIBG is injected into a vein and travels through the bloodstream. Neuroendocrine tumor cells take up the radioactive MIBG and are detected by a scanner. Scans may be taken over 1-3 days. An iodine solution may be given before or during the test to keep the thyroid gland from absorbing too much of the MIBG.
  • Octreotide scan: A type of radionuclide scan used to find certain tumors, including tumors that release catecholamine. A very small amount of radioactive octreotide (a hormone that attaches to certain tumors) is injected into a vein and travels through the bloodstream. The radioactive attaches to the tumor and a special camera that detects radioactivity is used to show where the tumors are in the body.
  • PET scan (positron emission tomography scan) or FDG-PET scan (fluorodeoxyglucose-positron emission tomography scan): A procedure to find malignant tumor cells in the body. A small amount of FDG, a type of radioactive glucose (sugar), is injected into a vein. The PET scanner rotates around the body and makes a picture of where glucose is being used in the body. Malignant tumor cells show up brighter in the picture because they are more active and take up more glucose than normal cells do. Other substances may be used to attach to the tumor to get a better picture.

There are three ways that cancer spreads in the body.

Cancer can spread through tissue, the lymph system, and the blood:

  • Tissue. The cancer spreads from where it began by growing into nearby areas.
  • Lymph system. The cancer spreads from where it began by getting into the lymph system. The cancer travels through the lymph vessels to other parts of the body.
  • Blood. The cancer spreads from where it began by getting into the blood. The cancer travels through the blood vessels to other parts of the body.

Cancer may spread from where it began to other parts of the body.

When cancer spreads to another part of the body, it is called metastasis. Cancer cells break away from where they began (the primary tumor) and travel through the lymph system or blood.

  • Lymph system. The cancer gets into the lymph system, travels through the lymph vessels, and forms a tumor (metastatic tumor) in another part of the body.
  • Blood. The cancer gets into the blood, travels through the blood vessels, and forms a tumor (metastatic tumor) in another part of the body.

The metastatic tumor is the same type of cancer as the primary tumor. For example, if pheochromocytoma spreads to the bone, the cancer cells in the bone are actually pheochromocytoma cells. The disease is metastatic pheochromocytoma, not bone cancer.

Many cancer deaths are caused when cancer moves from the original tumor and spreads to other tissues and organs. This is called metastatic cancer. This animation shows how cancer cells travel from the place in the body where they first formed to other parts of the body.

Pheochromocytoma and paraganglioma are described as localized, regional, or metastatic.

Localized pheochromocytoma and paraganglioma

The tumor is found in one or both adrenal glands (pheochromocytoma) or in one area only (paraganglioma).

Regional pheochromocytoma and paraganglioma

Cancer has spread to lymph nodes or other tissues near where the tumor began.

Metastatic pheochromocytoma and paraganglioma

The cancer has spread to other parts of the body, such as the liver, lungs, bone, or distant lymph nodes.

Pheochromocytoma and paraganglioma can recur (come back) after they have been treated.

The cancer may come back in the same place or in other parts of the body.

Treatment Option Overview

Key Points

  • There are different types of treatment for patients with pheochromocytoma or paraganglioma.
  • Patients receive medication to treat the signs and symptoms of pheochromocytoma and paraganglioma.
  • The following types of treatment are used:
    • Surgery
    • Radiation therapy
    • Chemotherapy
    • Ablation therapy
    • Embolization therapy
    • Targeted therapy
  • New types of treatment are being tested in clinical trials.
  • Treatment for pheochromocytoma and paraganglioma may cause side effects.
  • Patients may want to think about taking part in a clinical trial.
  • Patients can enter clinical trials before, during, or after starting their cancer treatment.
  • Follow-up tests will be needed.

There are different types of treatment for patients with pheochromocytoma or paraganglioma.

Different types of treatments are available for patients with pheochromocytoma or paraganglioma. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment

Patients receive medication to treat the signs and symptoms of pheochromocytoma and paraganglioma.

Drug therapy begins when pheochromocytoma or paraganglioma is diagnosed. This may include:

  • Drugs that keep the blood pressure normal. For example, one type of drug called alpha-blockers stops noradrenaline from making small blood vessels more narrow. Keeping the blood vessels open and relaxed improves blood flow and lowers blood pressure.
  • Drugs that keep the heart rate normal. For example, one type of drug called beta-blockers stops the effect of too much noradrenaline and slows the heart rate.
  • Drugs that block the effect of extra hormones made by the adrenal gland.

Drug therapy is often given for one to three weeks before surgery.

The following types of treatment are used:

Surgery

Surgery to remove pheochromocytoma is usually an adrenalectomy (removal of one or both adrenal glands). During this surgery, the tissues and lymph nodes inside the abdomen will be checked and if the tumor has spread, these tissues may also be removed. Drugs may be given before, during, and after surgery to keep blood pressure and heart rate normal.

After surgery to remove the tumor, catecholamine levels in the blood or urine are checked. Normal catecholamine levels are a sign that all the pheochromocytoma cells were removed.

If both adrenal glands are removed, life-long hormone therapy to replace hormones made by the adrenal glands is needed.

Radiation therapy

Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy:

The way the radiation therapy is given depends on the type of cancer being treated and whether it is localized, regional, metastatic, or recurrent. External radiation therapy and 131I-MIBG therapy are used to treat pheochromocytoma.

Metastatic pheochromocytoma is sometimes treated with 131I-MIBG, which carries radiation directly to tumor cells. 131I-MIBG is a radioactive substance that collects in certain kinds of tumor cells, killing them with the radiation that is given off. The 131I-MIBG is given by infusion. Not all pheochromocytomas take up 131I-MIBG, so a test is done first to check for this before treatment begins.

Chemotherapy

Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). Combination chemotherapy is treatment using more than one anticancer drug. Systemic chemotherapy is used to treat pheochromocytomas and paragangliomas.

Ablation therapy

Ablation is a treatment to remove or destroy a body part or tissue or its function. Ablation therapies used to help kill cancer cells include:

  • Radiofrequency ablation: A procedure that uses radio waves to heat and destroy abnormal cells. The radio waves travel through electrodes (small devices that carry electricity). Radiofrequency ablation may be used to treat cancer and other conditions.
  • Cryoablation: A procedure in which tissue is frozen to destroy abnormal cells. Liquid nitrogen or liquid carbon dioxide is used to freeze the tissue.

Embolization therapy

Embolization therapy is a treatment to block the artery leading to the adrenal gland. Blocking the flow of blood to the adrenal glands helps kill cancer cells growing there.

Targeted therapy

Targeted therapy is a type of treatment that uses drugs or other substances to identify and attack specific cancer cells. Tyrosine kinase inhibitors (TKIs) block signals needed for tumors to grow. Sunitinib, axitinib, and cabozantinib have been used as palliative therapy for metastatic and recurrent pheochromocytoma.

New types of treatment are being tested in clinical trials.

Information about clinical trials is available from the NCI website.

Treatment for pheochromocytoma and paraganglioma may cause side effects.

For information about side effects caused by treatment for cancer, visit our Side Effects page.

Patients may want to think about taking part in a clinical trial.

For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.

Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.

Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.

Patients can enter clinical trials before, during, or after starting their cancer treatment.

Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.

Clinical trials are taking place in many parts of the country. Information about clinical trials supported by NCI can be found on NCI’s clinical trials search webpage. Clinical trials supported by other organizations can be found on the ClinicalTrials.gov website.

Follow-up tests will be needed.

Some of the tests that were done to diagnose the cancer or to find out the extent of the cancer may be repeated. Some tests will be repeated to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment will be based on the results of these tests.

Some of the tests will continue to be done after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back). These tests are sometimes called follow-up tests.

For patients with pheochromocytoma or paraganglioma that causes symptoms, catecholamine levels in the blood and urine will be checked on a regular basis. Catecholamine levels that are higher than normal can be a sign that the cancer has come back.

For patients with paraganglioma that does not cause symptoms, follow-up tests such as CT, MRI, or MIBG scan should be done every year.

For patients with inherited pheochromocytoma, catecholamine levels in the blood and urine will be checked on a regular basis. Other screening tests will be done to check for other tumors that are linked to the inherited syndrome.

Talk to your doctor about which tests should be done and how often. Patients with pheochromocytoma or paraganglioma need lifelong follow-up.

Treatment of Pheochromocytoma and Paraganglioma

For information about the treatments listed below, see the Treatment Option Overview section.

Localized Pheochromocytoma and Paraganglioma

Treatment of localized benign pheochromocytoma or paraganglioma is usually surgery to completely remove the tumor. If the tumor is in the adrenal gland, the entire adrenal gland is removed.

Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.

Inherited Pheochromocytoma

In patients with inherited pheochromocytoma linked to multiple endocrine neoplasia (MEN2) or von Hippel-Lindau (VHL) syndrome, tumors often form in both adrenal glands. The tumors are usually benign.

  • Treatment for inherited pheochromocytoma that forms in one adrenal gland is surgery to completely remove the gland.
  • Treatment for inherited pheochromocytoma that forms in both adrenal glands or later forms in the remaining adrenal gland may be surgery to remove the tumor and as little normal tissue in the adrenal cortex as possible.

These surgeries may help patients avoid life-long hormone replacement therapy, acute adrenal insufficiency, and health problems due to the loss of hormones made by the adrenal gland.

Regional Pheochromocytoma and Paraganglioma

Treatment of pheochromocytoma or paraganglioma that has spread to nearby organs or lymph nodes is surgery to completely remove the tumor. Nearby organs that the cancer has spread to, such as the kidney, liver, part of a major blood vessel, and lymph nodes, may also be removed.

Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.

Metastatic Pheochromocytoma and Paraganglioma

Treatment of metastatic pheochromocytoma or paraganglioma may include the following:

Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.

Recurrent Pheochromocytoma and Paraganglioma

Treatment of recurrent pheochromocytoma or paraganglioma may include the following:

Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.

Pheochromocytoma During Pregnancy

Key Points

  • Pregnant women with pheochromocytoma need special care.
  • Treatment of pregnant women with pheochromocytoma may include surgery.

For information about the treatments listed below, see the Treatment Option Overview section.

Pregnant women with pheochromocytoma need special care.

Although it is rarely diagnosed during pregnancy, pheochromocytoma can be very serious for the mother and fetus. Women who have an increased risk of pheochromocytoma should have prenatal testing. Pregnant women with pheochromocytoma should be treated by a team of doctors who are experts in this type of care.

Signs of pheochromocytoma in pregnancy may include any of the following:

  • High blood pressure during the first 3 months of pregnancy.
  • Sudden periods of high blood pressure.
  • High blood pressure that is very hard to treat.

The diagnosis of pheochromocytoma in pregnant women includes testing for catecholamine levels in blood and urine. See the General Information section for a description of these tests and procedures. An MRI can be done to safely find tumors in pregnant women because it does not expose the fetus to radiation.

Treatment of pregnant women with pheochromocytoma may include surgery.

Treatment of pheochromocytoma during pregnancy may include the following:

  • Surgery to completely remove the cancer during the second trimester (the fourth through the sixth month of pregnancy).
  • Surgery to completely remove the cancer combined with delivery of the baby by cesarean section for patients diagnosed later in pregnancy.

To Learn More About Pheochromocytoma and Paraganglioma

About This PDQ Summary

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This PDQ cancer information summary has current information about the treatment of pheochromocytoma and paraganglioma. It is meant to inform and help patients, families, and caregivers. It does not give formal guidelines or recommendations for making decisions about health care.

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A clinical trial is a study to answer a scientific question, such as whether one treatment is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. During treatment clinical trials, information is collected about the effects of a new treatment and how well it works. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.

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PDQ® Adult Treatment Editorial Board. PDQ Pheochromocytoma and Paraganglioma Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/pheochromocytoma/patient/pheochromocytoma-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389499]

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Updated:

This content is provided by the National Cancer Institute (www.cancer.gov)
Syndicated Content Details:
Source URL: https://www.cancer.gov/node/150740/syndication
Source Agency: National Cancer Institute (NCI)
Captured Date: 2013-09-14 09:06:07.0