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Thyroid cancer is cancer of the thyroid gland. There are four forms: papillary, follicular, medulllary and anaplastic. The most common forms (papillary and follicular) are slow growing and may recur, but these forms are rarely fatal in patients under age 45. The medullary form also has a good prognosis if it is restricted to the thyroid gland and a poorer prognosis if there has been spread; anaplastic thyroid cancers are fast-growing and respond poorly to therapy.