Updated project metadata. Papillary thyroid cancer (PTC) accounts for the predominant histological types of all thyroid cancers. Additionally, 15% PTC with LNM are unfortunately associated with increased radioiodine resistance, distant metastasis, recurrence and increased mortality. Additionally, 15% PTC with LNM are unfortunately associated with increased radioiodine resistance, distant metastasis, recurrence and increased mortality.Two proteomics research has been implemented to investigate the molecular mechanisms involved in pathogenesis of PTC patients younger than 45 years with LNM and identified several candidate biomarker.However, until now there is no study to comprehensively investigate the differential expressed proteins (DEPs) in PTC patients older than age 45 years.