HPRT1 and head and neck squamous cell carcinoma: The Kaplan–Meier plot and log rank test uncovered that genetic alterations of the HPRT1 gene were not associated with the disease‐specific survival (P = 0.666; Fig. 6D), disease‐free survival (P = 0.194; Fig. 6E), progression‐free survival (P = 0.300; Fig. 6F) and OS (P = 0.130; Fig. 6G) of patients with HNSCC.