Our analysis revealed that the low expression of KCNQ4 correlated with longer OS in BRCA, LUAD (adenocarcinoma), ESCA, and PCPG (Fig. 5A), while the high expression of KCNQ4 was associated with shorter OS in KIRP, LUSC (squamous carcinoma), HCC, and UCEC patients (Fig. 5B). Here, KCNQ4 is linked to adenocarcinoma.