KRT5 and neoplasm: The tumor cells expressed synaptophysin(Figure 1C), cytokeratin MNF 116,cytokeratin 5/6 (CK5/6), cell adhesion molecule 5.2 (CAM5.2), p40, p63 (Figure 1E and F), without expression of thyroidtranscription factor 1 (TTF-1), GATA binding protein 3 (GATA3), chromogranin A, CD56, CD45, orS100.