KIAA1549 and pilocytic astrocytoma: noted that the KIAA1549 (15)-BRAF(9) fusion was most common in intramedullary pilocytic astrocytomas, identified in 80% of tumors with the fusion oncogene, while the KIAA1549(16)-BRAF(9) fusion was most common in intracranial pilocytic astrocytomas (86).