Fig. 3

Pathological findings. a Macroscopic examination of the primary lesion of the resected esophagus sized 92 × 54 mm. b Hematoxylin and eosin stains of the resected tissue specimen revealed moderately differentiated squamous cell carcinoma. c Immunohistochemistry of the resected tissue specimen showed positive staining for granulocyte colony-stimulating factor (G-CSF) in the cytoplasm of the tumor cells