CD68 and meningioma: We next carried out immunofluorescence staining in malignant meningioma tissues and showed that CD68+ macrophages were the major types of the immune cells compared with other immune cells (Fig. S2A-C), which was consistent with the results of immunohistochemistry analysis in mouse subcutaneous xenografts derived from the human malignant meningioma cell line IOMM-Lee (Figs. S2D-L).