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Immunoreactivity for ΔNp63 and CK5/6 in squamous cell carcinoma. A: Poorly differentiated non-small cell carcinoma in an endobronchial biopsy (HE, × 200). B: The tumor is positive for ΔNp63 (× 200). C: CK5/6 is also positive (× 200). D: The corresponding resected specimen showed focal keratinization in the tumor, confirming the diagnosis of squamous cell carcinoma (HE, × 200).
