CLCN4 and glioblastoma: We found: CLCN4 expression level was significantly positively correlated with GBM (P = 3.1E-02), KIRC (P = 1.92E-02), ACC (P = 1.81E-02), COAD (P = 1.44E-02), and BLCA (P = 4.05E-03).