Concomitant Bifocal Urothelial Carcinoma and Breast Tumor: Second Primary Cancer or Metastatic Spread to the Breast?

Figure 3

Tumor of the upper urinary tract: biopsy specimen with HER2 overexpression (3+) of tumor cells detected by immunohistochemistry (immunoperoxidase staining, primary monoclonal anti-HER2 antibody (clone CB11), original magnification x200).