Table 1.

Immunostains from primary and recurrent resection

Marker	Primary	Recurrent
GFAP	Diffusely, strongly positive	Diffusely, strongly positive
CD44	Diffusely, strongly positive	–
PDGFRA	Weakly positive in a subset	–
SOX2	Positive in majority of tumor cells	Positive in majority of tumor cells
OLIG2	Positive in a subset	Positive in a subset (~ 20%)
SOX10	–	Positive in a subset (~ 20%)
IDH1 R132H	Negative	–
ATRX	Preserved	–
PTEN	Negative	–
TP53	Rare cells	–
H3 K27M	Positive	Positive
KI67	Up to 2.8%	Up to 2.4%