EGFR and pilocytic astrocytoma: EGFR was consistently negative, MEOX2 was positive in a single ganglioglioma (1% of cells, mHS = 2), SOX11 in one PA (1% of cells, mHS = 1) and ependymoma (10% of cells, mHS = 10), CD34 in one pilocytic astrocytoma (1% of cells, mHS = 2), ependymoma (1% of cells, mHS = 1), subependymoma (20% of cells, mHS = 40) and three gangliogliomas (range 1–16% of cells, mHS 1–24).