Neurotrophic tyrosine receptor kinase (NTRK)-rearranged spindle cell neoplasms (NTRK-RSCNs) constitute a rare, heterogeneous subset of soft tissue tumors defined by oncogenic fusions involving NTRK1, NTRK2, or NTRK3 genes. The gene discussed is NTRK1; the disease is spindle cell neoplasm.