Fig. 4

Histopathological findings of resected specimen. A The tumor invaded into subserosa forming tumor nests and infiltration of lymphocytes and plasma cells to stroma was found (hematoxylin and eosin, magnification, ×). B Immunohistochemistry of p40. C Poorly differentiated SCC, exhibiting partial keratinization in the tumor cells (hematoxylin and eosin, magnification, ×). D Tumor cells were EBER positive according to in situ hybridization