From Citizendium - Reading time: 1 min
Thyroid cancer is cancer of the thyroid gland.[1]
The differentiated thyroid cancers are:[2]
A study of autopsies in Finland found that 36% of subjects had papillary thyroid cancer.[3]
Thyroid cancer may be present 5-10% of patients with thyroid nodules including incidentalomas.[4]
Thyroid cancer staging information from the National Cancer Institute's Physician Data Query

Chemotherapy is usually reserved for poorly differentiated tumors, medullary[5] and anaplastic[6] thyroid cancer.