Immunohistochemical staining of human breast tumors using mAb-1 and mAb-12 monoclonal antibodies against hPL.

<p>Term placenta (top) showing specific staining of the syncytial layer by both antibodies. Representative examples of staining-negative normal tissue and staining-positive and -negative tumors are shown. All normal tissues tested were negative and some, but not all tumors, were positive.