Secretion of IL‐13 and IL‐10 was higher in CD56dim NK subsets compared to those in CD56bri NK subsets among NGPB and NGBM (P = .008 and .01 for IL‐13, P = .034 and .007 for IL‐10, respectively), but was comparable between CD56dim and CD56bri NK subsets in GPB and GBM. Here, IL13 is linked to glioblastoma.