NTRK1 and gastrointestinal stromal tumor: In total, 16% of the WT GIST patients (5/31) had a TRK expression, and 16% (5/31) tested positive for NTRK1 (3/31: patients #1, #3, and #4) or NTRK3 (2/31: patients #2 and #5) fusions.