KRT20 and carcinoma: The tumor cells were positive for cluster of differentiation (CD) 10, cytokeratin (CK) AE1/AE3, cytokeratin 7, cytokeratin 20, cytokeratin 34βE12, GATA binding protein 3 (GATA3), and protein‐63 (p63), which are markers of lymphoepithelioma‐like carcinomas (Fig. 2).