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A: Endoscopic findings of an esophageal tumor; B: Biopsy histology of the esophageal tumor. It is small cell carcinoma. HE, x200; C: KIT protein is positive in the membrane. KIT immunostaining, x200; D: PDGFRA protein is positive in the membrane. PDGFRA immunostaining, x200; E: Synaptophysin is positive. Immunostaining, x200; F: KI-67 (MIB-1) labeling is 95%. Immunostaining, x200.
