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. 1987 Oct;84(20):7227–7231. doi: 10.1073/pnas.84.20.7227

Polymorphic expression of a human superficial bladder tumor antigen defined by mouse monoclonal antibodies.

Y Fradet 1, N Islam 1, L Boucher 1, C Parent-Vaugeois 1, M Tardif 1
PMCID: PMC299264  PMID: 3313389

Abstract

Three mouse monoclonal antibodies (mAbs), which define a highly restricted antigen, were obtained by simultaneous immunizations with superficial papillary bladder tumor cells and mouse polyclonal serum against normal urothelium. The antigen was detected by the avidin/biotin/peroxidase method in 30/44 superficial bladder tumors (68%) but in only 4/27 infiltrating urothelial cancers (with much less intensity). No normal adult or fetal tissues tested expressed the antigen, including normal urothelium from 40 individuals, 13 of whom had a bladder tumor positive for the antigen. Only 1 of 45 nonbladder tumors showed some reactivity with one of the three mAbs. Serological tests on a large panel of human cancer cell lines and normal cultured cells were negative. The antigen is highly stable and well preserved on paraffin-embedded tissues. Electrophoretic transfer blot experiments with fresh tumor extracts showed that all three mAbs react with a determinant on a component of 300,000 Mr (pI 9.5) and 62,000 Mr (pI 6.5). The antigen shows polymorphic expression at the cellular level on tissue sections and also at a molecular level on immunoblots where the two bands are differentially detected on extracts of a series of tumors but are not visualized on normal urothelium extracts. The characteristics of this antigenic system suggest that it may provide some insights about the biology of bladder cancer. Specific detection of the antigen on 70% of superficial bladder tumors with normal cytology may be useful for their diagnosis and follow-up.

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