Murine hybridoma antibodies against human transitional carcinoma-associated antigens.

Spleen cells from mice immunized with the human urinary bladder transitional cell carcinoma cell line 647V have been fused with a syngeneic myeloma cell line to produce hybridomas. Screening of supernatants from 40 hybridomas which reacted with the immunizing cell line identified antibodies recognizing a variety of common, shared and tumor-associated antigens as well as newborn calf serum dependent antigens. Three hybridoma antibodies, 9A7 , 2E1 and 2A6 , recognize antigens found on all the human transitional cell carcinoma cell lines and tissue preparations tested, but the antigens were not found on normal human tissue (including urothelium), thus demonstrating the capability of the antibodies to distinguish normal from malignant bladder transitional epithelium. These antibodies, however, otherwise differ in their patterns of reactivity, with 1 recognizing an antigen which is also expressed on highly anaplastic malignant non-transitional cell carcinoma cell lines and tumors, while the other 2 demonstrate reactivities which are far more restricted to transitional cell carcinoma.