KCNQ4 and cancer: The results were then visualized using a Venn diagram. Using the Estimate method, positive correlations were observed between the expression of KCNQ4 and immune infiltration in 12 cancer types, including LGG, STES, KIRP, KIPAN, PRAD, STAD, HNSC, THYM, LIHC, BLCA, THCA and GBM (Fig. 6A).