A pathologic examination showed neoplastic tissue composed of pleomorphic cells, while immunohistochemistry of the tumor cells was positive for vimentin and negative for Pan CK, EMA, S‐100, HMB‐45, SM‐actin, desmin, CD 31, CD 34, and CD 68, while 30% of tumor cells showed reactivity to Ki67. The gene discussed is MKI67; the disease is neoplasm.