Thyroid cancer, the most common endocrine tumor, constitutes 3.8% of all cancers. 62,980 new cases were estimated in the U.S. in 20141, an increasing trend from the 37,200 new cases in 20092. 90% of all thyroid cancers are differentiated thyroid carcinomas (DTC), which include both papillary and follicular thyroid carcinoma3.