Fig. 3. Representative immunohistochemical staining results of eccrine porocarcinoma. (A) Epithelial membrane antigen staining showed focal positivity within the tumors nests as well as ductal differentiation (original magnification: ×100). (B) Carcinoembryonic antigen staining highlightened ductal formation (original magnification: ×100). (C) The presence of ducts was also shown in periodic acid-Schiff with diastase staining (original magnification: ×100). (D) The tumor cells showed negative staining for S-100 (×100).
