TBX1 and neoplasm: The tumor cells showed positive staining for the expression of pan-cytokeratin (AE1/AE3) (Fig. 3b), S-100, brachyury (Fig. 3c), and SOX9 (Fig. 3d) but negative staining for the expression of calretinin, D2-40, KIT, CD34, DOG-1, desmin, alpha-SMA, Melan-A, HMB45, and SOX10.