NTRK1 and glioblastoma: Analogously to what has been observed in the GBM patients carrying the BCAN-NTRK1 fusion (Supplementary Fig. 5c), the generation of the Bcan-Ntrk1 rearrangement led to exceptionally high levels of the Ntrk1 3′ mRNA region involved in the gene fusion (Fig. 4d, bottom right panel).