Thyroid cancer is the most common cancer of glands, but only accounts for about 1 % of all cancers. Thyroid cancer most often affects people between the ages 25-65. There are four types of thyroid cancer: follicular, papillary, medullary and anaplastic. Age at diagnosis is one of the most important factors in determining prognosis, as are size and extra capsular extension–whether tumor has grown out side the thyroid.

What You Need to Know about Cancer of the Thyroid