Figure 2: Comparison of NSAF in the identified proteins in PTC tissues ( 𝑛 = 3 ) with NSAF in normal thyroid tissues ( 𝑛 = 3 ). Similar to previous reports, Keratin 19 (K1C19) and Dipeptidyl peptidase 4 (DPP4) were strongly expressed in PTC, and Fatty acid-binding protein 4 (FABP4) was strongly expressed in normal thyroid tissues. NPNT and MLEC were discovered as strongly expressed candidate markers in PTC (Normal: normal thyroid tissue, PTC: Papillary thyroid carcinoma, ND: not detectable).