Figure 4From: Metachronous isolated breast metastasis from pulmonary adenocarcinoma with micropapillary component causing diagnostic challenges Immunohistochemical staining of the left breast tumor after lumpectomy. (A) GCDFP-15 stain was negative in malignant cells (×400). (B) TTF-1 stain reveals nuclear positivity (×400). (C) CK-7 stain was positive in malignant cells (×400). (D) Napsin A stain was positive in malignant cells (×400).Back to article page