Summary
A monoclonal antibody 7A9 was raised against the tumour-associated glycoprotein TAG-12 purified from T47-D breast carcinoma cells. In immunoblots from cytosol of T47-D cells and from sera of breast cancer patients, antibody 7A9 detects the high molecular weight mucin-like TAG-12 antigen. A series of paraffin sections of normal, benign and malignant mammary tissues have been studied with monoclonal antibody 7A9 and the immunoalkaline phosphatase method. In resting gland, proliferating gland and fibroadenoma ducts, reactivity of 7A9 was mainly restricted to luminal membranes of epithelial cells and secretions. 77/79 primary breast carcinomas including ductal, lobular and various other carcinoma types showed cytoplasmic and/or membrane-associated staining with 7A9 in most tumour cells. Metastases (31/31) from different sites were also positive. Strong immunoreactivity with single tumour cells was noted in cytological preparations from freshly resected breast cancer tissue. Thus, monoclonal antibody 7A9 seems to be very useful for the targeting of breast carcinoma cells.
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Werner, M., von Wasielewski, R., Bernhards, J. et al. Analysis of the tumour-associated antigen TAG-12 by monoclonal antibody 7A9 in normal, benign and malignant mammary tissues. Vichows Archiv A Pathol Anat 416, 411–416 (1990). https://doi.org/10.1007/BF01605146
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DOI: https://doi.org/10.1007/BF01605146