BRAF and pilocytic astrocytoma: In this patient cohort, there were 18 patients confirmed negative for the KIAA1549–BRAF fusion including the diagnoses: glioneuronal tumor, astrocytoma NOS, pilocytic astrocytoma, gemistocitic astrocytoma, ganglioglioma, and LGG with pilocytic/pilomyxoid features (Table 2).