An immunohistochemical analysis of nonproliferating epithelial structures was carried out in 10 samples of human breast dysplasia and in 4 samples of tissue surrounding mammary gland carcinoma. Monoclonal mouse antibodies against individual prekeratins of rat monolayer epithelial antibodies of clone C12 against rat prekeratin with the molecular mass 49 kilodalton and antibodies of clone E3 against rat prekeratin with the molecular mass 40 kilodalton-monoclonal antibodies against vimentin (clone 30), as well as polyclonal antibodies against smooth muscle myosin and against the basement membrane glycoprotein laminin were used. The lining epithelium of all glandular structures reacted only with C12 antibodies. Two variants of myoepithelial cells containing myosin were detected. Variant I contains myosin and vimentin and is localized in intralobular ducts. Variant 2 contains myosin and prekeratin, recognized by E3 antibodies and is found in extralobular ducts.
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