Figure 2

Immunohistochemical staining. A: The epithelium of gland was positive staining for AE1/AE3. B-D: The tumor cells were negative staining for CD5, CD8 and CD56. E: The tumor cells were strongly diffuse positive staining for CD3. F: The tumor cells partially expressed CD30. G and H: CD20 and Pax-5 labeled the scattered B cells amidst the inflammatory infiltrate. I: The histiocytes among the inflammatory infiltrate were positive for CD68. M and N: CD31 and CD34 underlined the rich vascular channels, whereas the histiocytoid cells were negative. J: Ki67 index was about 20%. K and L: The intraepithelial lymphocytes in the adjacent mucosa were positive for CD3 and CD30.