WT1 and neoplasm: Immunohistochemically, the tumor cells expressed CK (AE1/AE3), EMA, and CK7, but were negative for p53, CK20, CDX2, inhibin-α, WT-1, calretinin, ER, chromogranin, synaptophysin, CD56, PAX8, and GATA3 (Figure 5).