GRN and glioblastoma: GRN expression was also positively correlated with the number of CD4+ T cells (r = 0.179, P = 2.41e-04), macrophages (r = 0.17, P = 4.91e-04), neutrophils (r = 0.114, P = 1.94e-02), and DCs (r = 0.583, P = 2.19e-39) infiltrating GBM.