Figure 1. Differential expression analysis of S100A9. (A) Differential expression of S100A9 between tumor tissues and normal tissues in pan-cancer. (B) Differential expression of S100A9 between GBM tissues and NBTs in the TCGA database. (C) Differential expression analysis of S100A9 in four independent GBM cohorts. (D, E) Immunohistochemical staining of 25 pairs of GBM tissues and corresponding adjacent tissues. (F, G) Western blotting detection of six pairs of GBM tissues and corresponding adjacent tissues.