Thyroid cancer

Thyroid cancer is a cancer originating from follicular or parafollicular thyroid cells. These cells give rise to both well-differentiated cancers—papillary thyroid cancer (PTC) and follicular thyroid cancer (FTC)—and anaplastic thyroid cancer (ATC), whose anaplastic cells are poorly differentiated. The second cell type, the C or parafollicular cell, produces the hormone calcitonin and is the cell of origin for medullary thyroid cancer (MTC).