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Histopathological staining. (A) Cytological smear revealing tumor cells of lung adenocarcinoma (magnification, ×200). (B) Hematoxylin and eosin staining revealing lung adenocarcinoma tumor cells (magnification, ×120). (C) Immunohistochemical staining revealing tumor cells positive for monoclonal anti-thyroid transcription factor-1 antibody (magnification, ×100).
