STAT6 and neoplasm: The tumor cells also stained positive for B-cell lymphoma 2 (Bcl-2; Fig. 3D, K), cluster of differentiation 99 (CD99; Fig. 3E), signal transducer and activator of transcription 6 (STAT6) (Fig. 3F, M) and Vimentin (Fig. 3L) but were negative for cytokeratin (CK), CD34, integrase interactor 1 (INI1), desmin, myoblast determination 1 (MyoD1), Wilms tumor protein 1 (WT-1) and S-100 protein (not shown).