Fig. 3
From: Esophageal metastases from primary lung cancer: a case report
Histological and immunohistochemical staining results. a Cancer tissue revealing the atypical nest shape of the cell arrangement (stain, hematoxylin and eosin [HE]; magnification, ×100). The positive immunohistochemical staining (magnification, ×200) for b TTF-1 and c CK-7 indicates that the cancer originated in the lung. TTF-1 is specific for tumors of lung origin. TTF-1 (thyroid transcription factor 1); CK (cytokeratin)