ITGA4 and glioblastoma: We then sorted CD45+/HLA‐DR+/CD49d+ cells (BMDMs) and CD45+/HLA‐DR+/CD49d− cells (MG) from the central intense fluorescence layer of GBM specimens based on 5‐ALA‐assisted surgery and confirmed the higher HMOX1 expression in BMDMs compared to MG by qRT‐PCR (Figure 1B, P = .029).