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Pathological findings of the biopsy specimen. (A) Hematoxylin and eosin (H&E) staining, 400×. Tumor cells are small and indicate solid alveolar growth and central necrosis. No adenocarcinoma component is seen. (B) Strong positive staining for chromogranin A, 400×; (C) strong positive staining for MIB1 index, 400×.
