HMOX1 and glioblastoma: Accordingly, we strengthened this finding in another group of experiments with BMDMs separated from GBM samples (Figure 2B) and confirmed it in an in vitro model of immunosuppressive macrophages derived from blood monocytes of HDs (Figure 2B, Mφ), whose relevant suppressive activity and HO‐1 expression (Figure S1) justified their use in investigating HO‐1‐related immunosuppressive mechanisms.