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Immunoreactivity for TTF1 and napsin A in adenocarcinoma. A: Endobronchial biopsy shows poorly differentiated non-small cell carcinoma in (HE, × 200). B: The tumor is positive for TTF1 (× 200). C: Napsin A is also positive (× 200). D: The corresponding resected specimen showed glands in the tumor, confirming the diagnosis of adenocarcinoma (HE, × 200).
