The oropharynx is the middle part of the pharynx (throat). The pharynx is a hollow tube that begins behind the nose and goes down to the neck, becoming part of the tube that extends into the stomach (esophagus). The oropharynx includes the base of the tongue, the tonsils, the soft palate (back of the mouth), and the walls of the pharynx.
Oropharyngeal cancer
Oropharyngeal cancer is a disease in which cancer cells are found within the anatomical borders of the oropharynx. The majority of oropharyngeal cancers are squamous cell carcinomas.
Symptoms of oropharyngeal cancer
The following might be signs of oropharyngeal cancer or of other conditions.
See a doctor if any of the following symptoms are present : -
A sore throat that persists
Pain or difficulty with swallowing
Unexplained weight loss
Voice changes
Ear pain
A lump in the back of the throat or mouth
A lump in the neck
Risk factors for oropharyngeal cancer
Risk factors for oropharyngeal cancer include the following : -
Use of alcohol
Use of tobacco
Being infected with the human papilloma virus (HPV), especially HPV-type-16 (HPV-16)
How is oropharyngeal cancer diagnosed ?
A doctor can diagnose oropharyngeal cancer by examining the throat. The doctor will use a mirror and lights to look at the throat and will feel the neck for masses. If the doctor finds abnormal tissue, he or she will obtain a piece of tissue in a procedure called a biopsy. The tissue will be checked for cancer cells.
Stages of oropharyngeal cancer
The stages of oropharyngeal cancer span from Stage 0 to Stage IV. In Stage 0, cancer is found only in the cells that line the oropharynx
Additional stages are described as follows : -
Stage I : - The cancer is 2 centimeters or smaller and has not spread outside the oropharynx.
Stage II : - The cancer is larger than 2 centimeters, but not larger than 4 centimeters and has not spread outside the oropharynx.
Stage III : - In this stage, cancer is larger than 4 centimeters and has not spread outside the oropharynx. An alternate form of this stage is that cancer is any size and has spread to only one lymph node on the same side of the neck as the cancer. The lymph node that contains cancer is 3 centimeters or smaller.
Stage IV : - This stage contains the sub-stages of IVA, IVB and IVC.
Stage IVA : -
In Stage IVA, one of the following is the case : -
The cancer has spread to tissues near the oropharynx, including the voice box, roof of the mouth, jaw, muscle of the tongue, or central muscles of the jaw. The cancer might have spread to one or more nearby lymph nodes, which are still not larger than 6 centimeters.
The cancer is any size, is only in the oropharynx, and has spread to one lymph node that is larger than 3 centimeters but no larger than 6 centimeters, or to more than one lymph node, none larger than 6 centimeters.
Stage IVB : -
In Stage IVB, one of the following is true : -
The cancer appears in a lymph node that is larger than 6 centimeters and might have spread to other tissues around the oropharynx.
The cancer surrounds the main artery in the neck or has spread to bones in the jaw or skull, to muscle in the side of the jaw, or to the upper part of the throat behind the nose. The cancer might have spread to nearby lymph nodes.
Stage IVC : - In Stage IVC, the cancer has spread to other parts of the body. The tumor might be any size and might have spread to lymph nodes.
Treatment of oropharyngeal cancer by stage
Stage I : - Treatment might be radiation therapy or surgery.
Stage II : - Treatment involves surgery to remove the cancer or radiation therapy.
Stage III : - Treatment for this stage of oropharyngeal cancer might include surgery to remove the cancer, followed by radiation therapy.
Other treatments might include : -
Radiation therapy alone
A clinical trial of chemotherapy that is followed by surgery or radiation therapy
A clinical trial of chemotherapy combined with radiation therapy
A clinical trial of new ways to provide radiation therapy
Stage IV
For cases in which oropharyngeal cancer can be removed by surgery, treatment might be one of the following : -
Surgery to remove the cancer that is followed by radiation therapy
Radiation therapy alone
A clinical trial combining radiation therapy and chemotherapy
A clinical trial of new ways to provide radiation therapy
For cases in which the cancer cannot be removed by surgery, treatment might include one of the following : -
Radiation therapy
A clinical trial during which chemotherapy is followed by surgery or radiation therapy
A clinical trial of radiation therapy given with chemotherapy or radiosensitizers (drugs to make the cancer cells more sensitive to radiation therapy)
A clinical trial of new ways of giving radiation therapy
A clinical trial of hyperthermia therapy plus radiation therapy
Prognosis (chance of recovery) for people with oropharyngeal cancers
The prognosis for people with oropharyngeal cancer depends on the age and health of the person and the stage of the disease. It is important for people with oral cancer or oropharyngeal cancer to have follow-up exams for the rest of their lives as cancer can occur in nearby areas. In addition, it is important to eliminate risk factors such as smoking and drinking, which increase the risk for second cancers.
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