Figure 3.

Weak and absent E-cadherin reactivity in two concurrent invasive "ductal" carcinomas (case 3). A: Larger invasive ductal carcinoma exhibiting weak staining for E-cadherin. Normal duct serves as an internal positive control (Immunoperoxidase stain for E-cadherin). B: Smaller invasive ductal carcinoma showing complete absence of staining for E-cadherin. Normal duct serves as an internal positive control (Immunoperoxidase stain for E-cadherin).