After using extended panel of immunohistochemical staining tumor cells showed the following pattern of expression: vimentin-(+), synaptophysin—(+), MCA (+)-, EMA(+), INI-1 (+), CD56 (+), β-catenin (+), NSE (+), SMA (+), CD30 (−), LCA (−), AFP (−), CD117 (−), CD10 (−), S-100 (−), CD99 (−), CD68 (−), and desmin (−). The gene discussed is CD99; the disease is neoplasm.