Monoclonal antibodies against carcinoma cells of the human urinary bladder: immunohistochemical staining of tissues.

We have previously described the generation of mouse monoclonal antibodies (Mabs) directed to cell surface antigens of human bladder carcinoma. Based on experiments with cultured cells and a limited number of freshly isolated tissues, four distinct antigens were identified as being associated with this disease. In the present investigation, comprising the immunostaining of tissues of normal, malignant, and fetal origin, we have confirmed and extended the close association of these antigens with bladder cancer. Antibodies to all four antigens could clearly discriminate between malignant and normal uroepithelium. Two of the antibodies, SK4H-12 and 4E8, showed no additional reaction when tested with various adult tissues of normal or malignant origin. Antibodies to the remaining two antigens gave a positive staining of a few other tissue types.