Fig. 3From: Metastatic papillary thyroid carcinoma in pleural effusion: a case report and review of the literatureImmunohistochemistry studies for different biological markers: The neoplastic cells showed positive staining for Ber-EP-4 (A), thyroid transcription factor-1 (TTF-1) (B), CK-7 (C), Pax-8 (the confirmatory test) (D), and thyroglobulin (E). Neoplastic cells showed negative staining for CK-20 (F) and clathrin (G). Magnification in all slides is 20×Back to article page