NTRK1 and glioblastoma: Currently, cell lines carrying NTRK2-fusions are not available, and commonly used glioblastoma-like cell lines such as U87MG, which were previously suggested to express functional TrkB protein [75], did not show much Trk expression (see Supplementary Information – TPM count table with RNAseq data: control U87MG cells express 0.25 transcripts per million of TrkB) or panTrk.