It has been identified that a small percentage of GIST patients harbor gene fusions.  Those with a NTRK fusion are eligible for the LOXO-195 trial:

Phase 1/2 Study of LOXO-195 in Patients With Previously Treated NTRK Fusions or Non-fusion NTRK Cancers

The trial can be viewed by clicking on this link:  http://Phase 1/2 Study of LOXO-195 in Patients With Previously Treated NTRK Fusions or Non-fusion NTRK Cancers