ATRX and astrocytoma (excluding glioblastoma): Immunohistochemical loss of ATRX expression (Fig. 2k, 69.2%, 9/13) did not appear as frequent as in astrocytoma supratentorial (92%, 46/50, p = 0.05, Fisher’s exact test) and high-grade astrocytoma supratentorial (86.8%, 33/38, p = 0.154, Fisher’s exact test).