CXCL6 and glioblastoma: By analyzing the expression level of CXCL6 in eight single‐cell RNA‐seq datasets of GBM and glioma from TISCH2 (http://tisch.comp‐genomics.org/home/) and GEO, we found that CXCL6 was expressed in macrophage cells in 4 of 7 datasets in TISCH2 and expressed in microglia cell in one dataset (Fig. S12A).