Thyroid Cancer

Thyroid Cancer Overview

The thyroid gland is located low in the front of the neck, below the Adam's apple. The gland is shaped like a butterfly and wraps around the windpipe or trachea. The two wings or lobes on either side of the windpipe are joined together by a bridge, called the isthmus, which crosses over the front of the windpipe.
Thyroid cancer accounts for nearly 2% of all new cancers diagnosed in the United States every year, according to the U.S. Surveillance, Epidemiology, and End Results cancer registry (SEER) predictions. Over the last 10 years, thyroid cancer has had a larger increase in incidence than any other type of cancer.
Thyroid cancer occurs in all age groups, although its incidence increases with age, especially after 30 years of age. More aggressive forms of thyroid cancer are found in older patients. Thyroid cancer occurs three times more frequently in women than in men. Thyroid cancer originates from one of two different types of thyroid cells: follicular cells or so-called parafollicular, or C cells.

 

 

Thyroid Cancer Treatment

Surgery
Surgery to remove all cancer in the neck and any cancerous lymph nodes is the initial therapy for most thyroid cancers. Complications are rare when the procedure is performed by an experienced thyroid surgeon.
Radioactive Iodine
Radioactive Iodine using I-131 is typically used as a follow-up to surgery, or "adjuvant" treatment in papillary and follicular thyroid cancers. This treatment is usually given two to six weeks following thyroid surgery. It involves giving high doses of I-131 in a liquid or pill form. Patients undergoing this treatment must restrict their dietary intake of iodine for approximately five to14 days before the treatment and must restrict their contact with children and pregnant women for three to seven days after treatment. The goals of this treatment include destruction of any remaining thyroid tissue in the neck, a reduction in cancer recurrence rate, and improved survival.
Radiation
Radiation treatment, known as external-beam radiation therapy, is used in patients with cancer that cannot be treated with surgery or is unresponsive to radioactive iodine, as well as for older patients with cancer that has distant spread. Radiation is sometimes combined with chemotherapy.
Chemotherapy
Chemotherapy is sometimes useful for progressive diseases unresponsive to radioactive iodine or radiation.
Treatments for the four thyroid cancer types
Papillary thyroid cancer responds to treatment with surgery and radioactive iodine.
Follicular thyroid cancer responds to treatment with surgery and radioactive iodine treatment.
Medullary thyroid cancer must be treated with surgical removal of the entire thyroid gland in addition to complete removal of all neck lymph nodes and fatty tissue. This type of cancer does not respond to radioactive iodine therapy and has a much lower cure rate than either papillary or follicular thyroid cancer. After surgery, patients should be followed every six to 12 months with a blood calcitonin level to watch for recurrence.
Anaplastic thyroid cancer often cannot be cured with surgery by the time of diagnosis (due to spread of the disease). This cancer is not responsive to radioactive iodine and may require radiation and chemotherapy.