IDH1 and oligodendroglioma: In one tumor of 59 glioma specimens, one rearrangement with 6225 fusion reads mapped fusing exon 5 of the gene ETV6 to exon 15 of NTRK3 was identified (Figure 5, Table 4) in oligodendroglioma–grade II, IDH-mutated and 1p19q co-deleted at frequency of 1.69%.