Laryngeal Cancer
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Cancer of the voice box (larynx), a common area of cancer within the head and neck, occurs more often in men than in women. It is linked to cigarette smoking and alcohol consumption.
Symptoms and Diagnosis
This cancer commonly originates on the vocal cords or the surrounding structures and often causes hoarseness. A person who has been hoarse for more than 2 weeks should seek medical attention. Cancer in other parts of the larynx causes pain and difficulty in swallowing or breathing. Sometimes, however, a lump in the neck resulting from the cancer’s spread to a lymph node (metastasis) may be noticed before any other symptoms.
To make the diagnosis, a doctor looks at the larynx through a laryngoscope (a thin viewing tube used for direct viewing of the larynx) and performs a biopsy (removal of a tissue sample for examination under a microscope). A biopsy is most often performed in the operating room, while the person is under general anesthesia. Occasionally, it may be performed in the doctor’s office, after a topical anesthetic has been applied.
Staging and Prognosis
Staging is a way for doctors to describe how advanced the cancer has become, taking into account both the size and spread of the cancer (see Symptoms and Diagnosis of Cancer: Diagnostic Tests and Staging). Staging helps the doctor guide therapy and assess prognosis. Cancer of the larynx is staged according to the size and location of the original tumor, the number and size of metastases to the lymph nodes in the neck, and evidence of metastases in distant parts of the body. Stage I cancer is the least advanced, and stage IV is the most advanced.
The larger the cancer and the more it has spread, the worse the prognosis. If the tumor has also invaded muscle, bone, or cartilage, cure is less likely. Almost 90% of people with small cancers that have not spread anywhere survive for 5 years, compared with fewer than 50% of those who have cancer that has spread to the local lymph nodes. For people who have metastases beyond the local lymph nodes, the chance of surviving longer than 2 years is poor.
Treatment
Treatment depends on the stage and the precise location of the cancer within the larynx. For cancer in an early stage, doctors may use either surgery or radiation therapy. Usually, radiation is aimed not only at the cancer but also at the lymph nodes on both sides of the neck, because many of these cancers spread to those lymph nodes. When the vocal cords are affected, radiation therapy may be preferred over surgery because it may preserve a more normal voice. However, for very early cancers of the larynx, microsurgery, sometimes performed with a laser, provides identical cure rates with equal preservation of the voice and can be completed in a single treatment.
Tumors larger than 3/4 inch and those that have invaded bone or cartilage are usually treated with combination therapy. One combination consists of radiation therapy plus surgery to remove part or all of the larynx and vocal cords (partial or total laryngectomy). Radiation therapy also may be combined with chemotherapy. This treatment provides equivalent cure rates to the radiation and surgery combination, and the voice is preserved in a significant number of people. However, surgery may still be required to remove any cancer that remains after this treatment. If the cancer is too advanced for surgery or radiation therapy, chemotherapy can help reduce the pain and the size of the tumor but is unlikely to provide a cure.
Treatment almost always has significant side effects. Surgery often affects swallowing and speaking; in such cases, rehabilitation is necessary. A number of methods have been developed that allow people without vocal cords to speak, often with excellent results. Depending on the specific tissue removed, reconstructive surgery may be performed. Radiation may cause skin changes (such as inflammation, itching, and loss of hair), scarring, loss of taste, and dry mouth, and occasionally, destruction of normal tissues. People whose teeth will be exposed to the radiation treatments must have dental problems corrected and any unhealthy teeth removed, because radiation will make any subsequent dental work more likely to fail, and severe infections of the jawbone may occur. Chemotherapy typically produces a variety of side effects, depending on the drug used; these effects may include nausea, vomiting, hearing loss, and infections.
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