The neoplasm showed positivity for Smooth Muscle Actin, MDM2 (focally), and pan-TRK (Figure 3C), while Caldesmon, CD31, CK AE1/AE3, Desmin, ERG, S100, SATB2, STAT6, H3F3A (G34V), H3F3A (G34W), H3F3A (G34R), SS18-SSX, SSX, STAT6, and CD34 were negative. The gene discussed is NTRK1; the disease is neoplasm.