Tumor cells were negative for epithelial markers AE1/AE3 and CAM5.2, and also negative for p40, NUT, chromogranin, desmin, NKX2.2, S100, SOX10, HMB45, GATA3, CD45 (LCA), CD3, and CD20, with intact INI1 and BRG1 nuclear expression. This evidence concerns the gene PMEL and neoplasm.