Papillary thyroid carcinoma(PTC) is the most common type of thyroid carcinoma with an average 5-year survival rate of 97.9%. However, some patients die of poor prognosis.Because of the rising incidence of thyroid cancer and detection of subclinical nodules,a risk assessment method for identifying high risk population and guiding clinical decision is needed. Recently significant progress has been made in study about PTC molecular markers.BRAF mutation served as an excellent biomarker in diagnose and aggressi...