CDKN2A and glioma: Interestingly, several reports have also shown that pediatric grade I gliomas harboring CDKN2A loss, despite their rarity, have a more aggressive clinical course consistent with that of a higher histological grade [173, 190] and co-occurrence of CDKN2A deletion with BRAF fusions has been described in anaplastic astrocytoma with piloid features [178].