Abstract
We evaluated the immunohistological (IH) characteristics of 22 different antibodies that were submitted for study in the frame of the TD-1 ISOBM Workshop on monoclonal antibodies against CA125. Information on relative affinities and epitope similarities was obtained from a parallel immunochemical study. Antibodies were tested at concentrations of 10 and 1 micrograms/ml on frozen and paraffin sections. Paraffin sections were stained according to the streptavidin-biotin complex protocol, and frozen sections according to a two-step immunoperoxidase technique. Aminoethylcarbazole served as the chromogen. The tissues were from normal proliferative endometrium (formalin-fixed paraffin-embedded) material and clear-cell adenocarcinoma of the ovary (formalin-fixed paraffin-embedded and frozen material). Sections were scored for staining in epithelial cells, basal, apical and diffuse cytoplasmic and in stromal components. Intensity was graded as 1, 2 or 3 for epithelial cells and as -1, -2 or -3 for stroma. The cumulative scores for each antibody expressed the discriminative properties of specific epithelial staining against background. M11 and M11-like antibodies, as well as OC125 and OC125-like antibodies, in general showed good staini...Continue Reading
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