SAA1 and oligodendroglioma: The gene expression of SAA1 in patients with GBM (214 cases) was at least fourfold higher than that in patients with oligodendrogliomas (66 cases) (P = 0.0062), patients with astrocytomas (145 cases) (P < 0.0001), and normal patients (21 cases) (P = 0.05) (Fig. 2G).