Figure 1.

Immunohistochemical staining for activated leukocyte cell adhesion molecule (ALCAM). (a) Normal (non-neoplastic) breast tissue; formalin-fixed, paraffin-embedded tissue. Note staining in normal ducts. (b) Human breast carcinoma (infiltrating ductal carcinoma); formalin-fixed, paraffin-embedded tissue. Note strong membranous staining in breast cancer. (c) Normal (non-neoplastic) breast tissue; frozen tissue. Note staining in normal ducts. (d) Human breast carcinoma; frozen tissue. Note staining of invasive breast carcinoma.