FGFR1 and oligodendroglioma: When they screened posterior fossa tumors of glial origin for the prevalence of FGFR1 mutations, Sievers et al. found a subset of nine tumors, in which 75% had a FGFR1-TACC1 fusion and could be distinguished in their gene expression pattern from other molecular phenotypes, so that the group even suggested defining these as a new molecular subtype, called “pediatric-type oligodendroglioma” [70].