Fig. 4

Correlation between the four markers for various patient groups. Correlation between the four biomarkers for GBM (n = 77), astrocytoma with mutant IDH no 1p19q co-deletion (n = 26), oligodendroglioma mutant IDH with 1p19q co-deletion (n = 23), secondary tumors (n = 35), meningioma (n = 70), Schwannoma (n = 15), pituitary adenoma (n = 15) and normal controls (n = 30). Spearman correlation is shown on the right bottom corner of each plot. NEFL shows the strongest correlation with GFAP (r = 0.74). The reported Spearman correlations were calculated by including all patient groups