Immunohistochemical stains demonstrated positivity of the tumor with sex-determining region Y-box 10 (SOX10) and negative staining with smooth muscle actin (SMA), Cluster of Differentiation 10 (CD10), protein 40 (P40), cytokeratin 5/6 (CK5/6), and melanin (Figures 4, 5). This evidence concerns the gene KRT5 and neoplasm.