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Cytolytic and tumor inhibitory antibodies against UK114 protein in the sera of cancer patients.

UK114 is a 14 kDa protein identified in the perchloric acid soluble extract of goat liver. Anti-UK114 antibodies identify this protein as expressed by the membrane of human cancer cells. In the present study, anti-UK114 antibodies were detected in the sera of cancer patients by ELISA and by immunofluorescence tests using human cancer cell lines as a target. UK114 protein is antigenic in cancer patients. Human anti-UK114 antibodies have cytolytic effects in vitro and their presence correlates with inhibition of growth of human carcinoma cells xenografted in nu/nu mice. This finding may open new prospects for immunotherapy.