Objective To evaluate the diagnostic value of TPO,CD56 and GPC-3 in papillary thyroid carcinoma( PTC). Methods Immunohistochemical staining was performed in 80 specimens of PTC and 77 specimens of papillary benign lesions to examine the expression of TPO protein,CD56 protein and GPC-3 protein. Results The positive ratios of TPO,CD56 and GPC-3 were 11. 2%,8. 8% and 88. 8% in PTC,respectively,and their positive ratios in benign lesions were 88. 3%,93. 5% and 2. 6%. There were all statistical difference betwee...