Our results revealed that STAT3 expression was positively correlated with infiltration of macrophages, dendritic cells, CD4+ T cells, CD8+ T cells, neutrophils, and B cells (all r > 0.06, p < 0.005) in all cancer types analyzed, with the exception of glioblastoma multiforme (GBM). Here, CD4 is linked to glioblastoma.