KCNC4 and adenocarcinoma: According to the KM plotter of KCNC4, high expression levels of KCNC4 decreased overall survival in both adenocarcinoma (Fig. 6A, hazard ratio (HR) = 1.62, 95% confidence intervals (CI) = 1.25–2.11, log rank P = 0.00025, n = 1105) and squamous cell carcinoma (Fig. 6B, HR = 1.44, 95% CI = 1.04–1.98, log rank P = 0.025, n = 444).