PTENP1 and head and neck squamous cell carcinoma: The univariate COX proportional Hazards regression analysis showed that the PTENP1 level was an independent predictor of the OS (P = 0.005; HR:0.170; Cl:0.049 to 0.590) and DFS (P = 0.009; HR:0.195; Cl:0.057 to 0.664) in patients with HNSCC (Table 2).