Oropharyngeal cancer is a disease in which malignant (cancer) cells form in the tissues of the oropharynx.

The oropharynx is the middle part of the pharynx (throat) behind the mouth. It includes the following:

• Back one-third of the tongue.
• Soft palate.
• Side and back walls of the throat.
• Tonsils.

The pharynx is a hollow tube about 5 inches long that starts behind the nose and ends where the trachea (windpipe) and esophagus (tube from the throat to the stomach) begin. Air and food pass through the pharynx on the way to the trachea or the esophagus.

Figure

Anatomy of the pharynx (throat). The three parts of the pharynx are the nasopharynx, oropharynx, and hypopharynx.

Oropharyngeal cancer is a type of head and neck cancer. Sometimes more than one cancer can occur in the oropharynx and in other parts of the oral cavity, nose, throat, larynx (vocal cords), trachea, or esophagus at the same time.

Most oropharyngeal cancers are squamous cell carcinomas. Squamous cells are the thin, flat cells that line the inside of the oropharynx.

Smoking or being infected with human papillomavirus can increase the risk of oropharyngeal cancer.

Anything that increases your risk 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 mean that you will not get cancer. Talk with your doctor if you think you may be at risk.

The most common risk factors for oropharyngeal cancer include the following:

• Being infected with human papillomavirus (HPV). The number of oropharyngeal cancers linked to HPV infection is increasing.
• A history of smoking for more than 10 pack years.
• Heavy alcohol use.

Other risk factors for oropharyngeal cancer include:

• A diet low in fruits and vegetables.
• Drinking maté, a stimulant drink common in South America.
• Chewing betel quid, a stimulant commonly used in parts of Asia.

See the following PDQ summaries for more information:

• Hypopharyngeal Cancer Treatment
• Lip and Oral Cavity Cancer Treatment
• Oral Cavity and Oropharyngeal Cancer Prevention

Signs and symptoms of oropharyngeal cancer include a lump in the neck and a sore throat.

These and other signs and symptoms may be caused by oropharyngeal cancer or by other conditions. Check with your doctor if you have any of the following:

• A sore throat that does not go away.
• Trouble swallowing.
• Trouble opening the mouth fully.
• Trouble moving the tongue.
• Weight loss for no known reason.
• Ear pain.
• A lump in the back of the mouth, throat, or neck.
• A change in voice.
• Coughing up blood.

Sometimes oropharyngeal cancer does not cause early signs or symptoms.

Tests that examine the mouth and throat are used to help detect (find), diagnose, and stage oropharyngeal cancer.

The following tests and procedures may be used:

• Physical exam and history: An exam of the body to check general signs of health, including checking for signs of disease, such as swollen lymph nodes in the neck or anything else that seems unusual. The medical doctor or dentist does a complete exam of the mouth and neck and looks down the throat with a small, long-handled mirror to check for abnormal areas. A history of the patient’s health habits and past illnesses and treatments will also be taken.
• PET-CT scan: A procedure that combines the pictures from a positron emission tomography (PET) scan and a computed tomography (CT) scan. The PET and CT scans are done at the same time with the same machine. The combined scans give more detailed pictures of areas inside the body than either scan gives by itself. A PET-CT scan may be used to help diagnose disease, such as cancer, plan treatment, or find out how well treatment is working.

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  CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye is 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.

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  PET scan (positron emission tomography scan): A procedure to find malignant tumor cells in the body. A small amount 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.

• 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. This procedure is also called nuclear magnetic resonance imaging (NMRI).
• Biopsy: The removal of cells or tissues so they can be viewed under a microscope by a pathologist to check for signs of cancer. A fine-needle biopsy is usually done to remove a sample of tissue using a thin needle.
  The following procedures may be used to remove samples of cells or tissue:

  • Endoscopy: A procedure to look at organs and tissues inside the body to check for abnormal areas. An endoscope is inserted through an incision (cut) in the skin or opening in the body, such as the mouth or nose. An endoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove abnormal tissue or lymph node samples, which are checked under a microscope for signs of disease. The nose, throat, back of the tongue, esophagus, stomach, voice box, windpipe, and large airways will be checked. The type of endoscopy is named for the part of the body that is being examined. For example, pharyngoscopy is an exam to check the pharynx.
  • Laryngoscopy: A procedure in which the doctor checks the larynx (voice box) with a mirror or with a laryngoscope. A laryngoscope is a thin, tube-like instrument with a light and a lens for viewing.
  • Oral brush exam: A procedure in which the medical doctor or dentist uses a small brush to remove cells that may be cancer. The cells are checked under a microscope for signs of disease.
  If cancer is found, the following test may be done to study the cancer cells:

  • HPV test: A laboratory test used to check the sample of tissue for certain types of HPV infection. This test is done because oropharyngeal cancer can be caused by the HPV virus.

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

The prognosis (chance of recovery) depends on the following:

• The stage of the cancer.
• The number and size of lymph nodes with cancer.
• Whether the patient has HPV infection of the oropharynx.
• Whether the patient has a history of smoking for more than ten pack years.

Oropharyngeal tumors related to HPV infection have a better prognosis and are less likely to recur than tumors not linked to HPV infection.

Treatment options depend on the following:

• The stage of the cancer.
• Keeping the patient's ability to speak and swallow as normal as possible.
• The patient's general health.

Patients with oropharyngeal cancer have an increased risk of another cancer in the head or neck. This risk is increased in patients who continue to smoke or drink alcohol after treatment.

See the following PDQ summaries for more information:

• Smoking in Cancer Care
• Cigarette Smoking: Health Risks and How to Quit

After oropharyngeal cancer has been diagnosed, tests are done to find out if cancer cells have spread within the oropharynx or to other parts of the body.

The process used to find out if cancer has spread within the oropharynx or to other parts of the body is called staging. The information gathered from the staging process determines the stage of the disease. It is important to know the stage in order to plan treatment. The results of some of the tests used to diagnose oropharyngeal cancer are often used to stage the disease.

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 oropharyngeal cancer spreads to the lung, the cancer cells in the lung are actually oropharyngeal cancer cells. The disease is metastatic oropharyngeal cancer, not lung cancer.

The following stages are used for oropharyngeal cancer:

Stage 0 (Carcinoma in Situ)

In stage 0, abnormal cells are found in the lining of the oropharynx. These abnormal cells may become cancer and spread into nearby normal tissue. Stage 0 is also called carcinoma in situ.

Figure

Pea, peanut, walnut, and lime show tumor sizes.

There are different types of treatment for patients with oropharyngeal cancer.

Different types of treatment are available for patients with oropharyngeal cancer. 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 with oropharyngeal cancer should have their treatment planned by a team of doctors with expertise in treating head and neck cancer.

The patient's treatment will be overseen by a medical oncologist, a doctor who specializes in treating people with cancer. Because the oropharynx helps in breathing, eating, and talking, patients may need special help adjusting to the side effects of the cancer and its treatment. The medical oncologist may refer the patient to other health professionals with special training in the treatment of patients with head and neck cancer. These may include the following specialists:

• Head and neck surgeon.
• Radiation oncologist.
• Plastic surgeon.
• Dentist.
• Dietitian.
• Psychologist.
• Rehabilitation specialist.
• Speech therapist.

Four types of standard treatment are used:

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. External radiation therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer.

Figure

External-beam radiation therapy of the head and neck. A machine is used to aim high-energy radiation at the cancer. The machine can rotate around the patient, delivering radiation from many different angles to provide highly conformal treatment. A mesh (more...)

The way the radiation therapy is given depends on the type and stage of the cancer being treated. External radiation therapy is used to treat oropharyngeal cancer. Different types of external radiation therapy include the following:

• Intensity-modulated radiation therapy (IMRT): IMRT is a type of 3-dimensional (3-D) radiation therapy that uses a computer to make pictures of the size and shape of the tumor. Thin beams of radiation of different intensities (strengths) are aimed at the tumor from many angles. This type of radiation therapy causes less damage to healthy tissue near the tumor.
• Stereotactic radiosurgery: A type of radiation therapy that aims a single large dose of radiation directly at the tumor. This causes less damage to nearby healthy tissue. Stereotactic radiosurgery is also called stereotaxic radiosurgery, radiosurgery, and radiation surgery. This procedure is not a type of surgery.

In oropharyngeal cancer, dividing the daily dose of radiation into two treatments improves the way the tumor responds to treatment. This is called hyperfractionated radiation therapy.

Radiation therapy may work better in patients who have stopped smoking before beginning treatment.

Radiation therapy to the thyroid or pituitary gland increases the risk of hypothyroidism (too little thyroid hormone). Thyroid function tests should be done before and after treatment.

New types of treatment are being tested in clinical trials.

Information about clinical trials is available from the NCI website.

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. See the Treatment Options section that follows for links to current treatment clinical trials. These have been retrieved from NCI's listing of clinical trials.

Follow-up tests may be needed.

Some of the tests that were done to diagnose the cancer or to find out the stage of the cancer may be repeated. Some tests will be repeated in order 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). These tests are sometimes called follow-up tests or check-ups.

Following treatment, it is important to have careful head and neck exams to look for signs that the cancer has come back. Check-ups will be done every 6 to 12 weeks in the first year, every 3 months in the second year, every 3 to 4 months in the third year, and every 6 months thereafter.

Stage I and Stage II Oropharyngeal Cancer

Treatment of stage I and stage II oropharyngeal cancer may include the following:

• Radiation therapy.
• Surgery.

Check the list of NCI-supported cancer clinical trials that are now accepting patients with stage I oropharyngeal cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. Talk with your doctor about clinical trials that may be right for you. General information about clinical trials is available from the NCI website.

Stage III Oropharyngeal Cancer

Treatment of stage III oropharyngeal cancer may include the following:

• Surgery followed by radiation therapy. Chemotherapy also may be given at the same time as radiation therapy for patients at high risk for the cancer to come back.
• Radiation therapy alone for patients who cannot have chemotherapy.
• Radiation therapy given at the same time as targeted therapy.
• Chemotherapy given at the same time as radiation therapy.
• A clinical trial of chemotherapy followed by surgery or radiation therapy.
• A clinical trial of surgery followed by radiation therapy and targeted therapy.
• A clinical trial of transoral robotic surgery followed by radiation therapy with or without chemotherapy.

Check the list of NCI-supported cancer clinical trials that are now accepting patients with stage III oropharyngeal cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. Talk with your doctor about clinical trials that may be right for you. General information about clinical trials is available from the NCI website.

Stage IV (Not Metastatic) Oropharyngeal Cancer

Treatment of stage IV oropharyngeal cancer that has not spread to other parts of the body may include the following:

• Surgery followed by radiation therapy. Chemotherapy also may be given at the same time as radiation therapy to patients at high risk for the cancer to come back.
• Radiation therapy given at the same time as chemotherapy.
• Radiation therapy given at the same time as targeted therapy.
• Chemotherapy followed by radiation therapy given at the same time as more chemotherapy.
• Radiation therapy alone for patients who cannot have chemotherapy.
• A clinical trial of chemotherapy followed by surgery.
• A clinical trial of transoral robotic surgery.

Check the list of NCI-supported cancer clinical trials that are now accepting patients with stage IV oropharyngeal cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. Talk with your doctor about clinical trials that may be right for you. General information about clinical trials is available from the NCI website.

Stage IV (Metastatic) and Recurrent Oropharyngeal Cancer

Treatment of stage IVoropharyngeal cancer that has spread to other parts of the body or that has recurred (come back) may include the following:

• Radiation therapy.
• Surgery.
• Chemotherapy for patients with cancer that has spread to other parts of the body or recurrent cancer that cannot be removed by surgery.
• Radiation therapy given at the same time as chemotherapy.
• A clinical trial of chemotherapy with or without targeted therapy.
• Clinical trials of targeted therapy, stereotactic radiosurgery, or hyperfractionated radiation therapy given at the same time as chemotherapy.

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