The epithelioid component of the tumor was positive for CD117 (Fig. 2c) and vimentin (Fig. 2g) but negative for DOG-1 (Fig. 2e), MyoD-1 (Fig. 2l), myogenin (Fig. 2k), desmin (not shown), and SMA (not shown) by immunohistochemical (IHC) stains. The gene discussed is SMN1; the disease is neoplasm.