Epithelial tumor antigen

"Epithelial malignancy antigens" is not a standard scientific term but appears to refer broadly to **epithelial tumor antigens**—a diverse group of cell-surface molecules expressed on malignant epithelial cells. These include well-characterized targets such as carcinoembryonic antigen (**CEA**), prostate-specific antigen (**PSA**), human epidermal growth factor receptor 2 (**HER2/neu**), and mucin 1 (**MUC1**) among others. These antigens are often overexpressed or aberrantly expressed in carcinomas—the most common type of cancer arising from epithelial tissue—and serve as both diagnostic biomarkers and therapeutic targets. They can be classified molecularly as glycoproteins, receptors, or oncofetal proteins depending on the specific molecule. Therapeutic strategies targeting these antigens include monoclonal antibodies that mediate immune destruction of cancer cells by recognizing these cell-surface markers. However, because many so-called "tumor-associated" epithelial antigens are also present at lower levels in normal tissues, there is a risk of off-target effects. The term "epithelial malignancy antigens" is imprecise; it would be more accurate to specify the particular molecule(s) involved—such as "carcinoembryonic antigen," "HER2/neu," etc.—to ensure clarity regarding structure, function, and clinical relevance.[1][4][5][7]

Other names

Epithelial malignancy antigen (non-standard, see below)Epithelial tumor antigenCEA (Carcinoembryonic antigen, example of an epithelial tumor antigen)HER2/neu (example)MUC1 (example)PSA (Prostate-specific antigen, example)

Monoclonal antibody binding to cell surface antigens leading to immune-mediated cytotoxicity[7]