KRT7 and testicular germ cell tumor: Staining was negative for Desmin and Caldesmon (ruling out smooth muscle origin), Cytokeratin 7 (CK7) and Epithelial Membrane Antigen (EMA) (ruling out epithelial origin), and the germ cell tumor markers Wilms Tumor 1 (WT1), Spalt-like transcription factor 4 (SALL4), and Octamer-binding transcription factor 4 (OCT4).