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Small cell lung carcinoma: (a) Nests and sheets of small round cells with scant cytoplasm, nuclear hyperchromasia, molding, and inconspicuous nucleoli (H and E, ×400). (b) Cells show nuclear positivity for TTF-1 (poly-HRP, ×400). (c) Tumor cells were positive for synaptophysin (poly-HRP, ×400). (d) Cells show a high ki67 labeling index (poly-HRP, ×400)
