Two of these cases (18%) (liponeurocytoma, glioblastoma) with Pan-Trk expression (diffuse, partial) were found to have NTRK2-fusions (SLC O 5A1-NTRK2, AGBL4-NTRK2, BEND5-NTRK2) and these cases were adult. This evidence concerns the gene NTRK1 and glioblastoma.