The American Joint Committee for Cancer has adopted a size-based T stage system (eighth edition) for pancreatic ductal adenocarcinoma (PDAC), defined as follows: pT1≤2 cm (pT1a≤0.5 cm, pT1b>0.5 and2 and ≤4 cm; and pT3> 4 cm. However, the prognostic value of this new T staging system has not been validated in patients who underwent pancreaticoduodenectomy (PD) after neoadjuvant therapy. In this study, we analyzed 398 PDAC patients who underwent neoadjuvant therapy and PD at our institution from 1999 to 2012. The results were correlated with clinicopathologic parameters and survival. The new T stage correlated with lymph nodes metastasis (P0.05). In multivariate analysis, new ypT3 stage was associated with shorter OS (P=0.04), but not DFS (P=0.16). Our results show that the new ypT stage better stratify survival than the ypT stage in American Joint Committee for Cancer seventh edition for PDAC patients who received PD after neoadjuvant therapy, and that tumor size cutoff of 1.0 cm work better for ypT2 than the proposed tumor size cutoff of 2.0 cm in this group of patients.