CD163 and glioblastoma: Across the GBM subtypes, CD163+ cells were the most abundant cell population in all subtypes, but there were significantly more frequent in mesenchymal samples (mesenchymal (78.94% ± 24.41) vs classical (43.02% ± 45.79), p < 0.001; vs proneural (25.44% ± 26.26), p = 0.003; vs neural (43.02% ± 45.79), p = 0.0007)) (Fig. 6).