When GBM samples were clustered by GM-CSF and FGL2 expression levels (FGL2highGM-CSFlow, FGL2highGM-CSFhigh, FGL2lowGM-CSFlow, and FGL2lowGM-CSFhigh), OS differed significantly among the four clusters (P = 0.019) (Fig. 7e). Here, FGL2 is linked to glioblastoma.