CD4 and glioblastoma: For CD4+ T cells, positive correlations were observed in five cancer types: OC (r = 0.164, p < 0.001), GBM (r = 0.140, p < 0.05), KIRP (r = 0.194, p < 0.05), KIRC (r = 0.287, p < 0.001), and KICH (r = 0.287, p < 0.001).