According to the Kaplan–Meier overall survival (OS) analysis, the prognosis of patients with a high expression of CASC19 in head and neck squamous cell carcinoma (HNSC) was significantly worse than that of HNSC patients with a low expression of CASC19 (Figure 2F) (data from GEPIA database). This evidence concerns the gene CASC19 and head and neck squamous cell carcinoma.