The tumor was positive for CD117 (Fig. 3e), Vim, CD56 (Fig. 3f) and NSE and showed focal expression of desmin but was negative for myogenin, S-100, SYN, INSM1, CD34, STAT6, INI-1, Brachyury, ERG, TLE1, AE1/AE3, WT-1, CD99 and SMA. The gene discussed is TBX1; the disease is neoplasm.