IDH3A and glioblastoma: As per the 5th edition of the World Health Organisation Classification of Tumors of the Central Nervous System (CNS WHO), adult-type diffuse gliomas are classified by combined histological and molecular features into: astrocytomas which are isocitrate dehydrogenase (IDH)-mutant, CNS WHO grades 2–4; oligodendrogliomas which are IDH-mutant and 1p/19q-codeleted, CNS WHO grades 3–4; and glioblastomas which are IDH-wildtype, CNS WHO grade 4 [1].