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Cytokine-induced killer (CIK) cells are ex vivo activated and expanded CD8⁺ natural killer T cells that have been shown to have antitumor activity. This is the first study exploring cell killing of primary ovarian carcinoma cells with and without bispecific antibodies. Primary cancer cells and autologous CIK cells were collected from women with epithelial ovarian cancer. Bispecific antibodies against cancer antigen-125 (BSAbxCA125) and Her2 (BSAbxHer2) were developed using chemical heteroconjugation. On fluorescence-activated cell sorting analysis, the expansion of CIK cells resulted in a significant increase of CD3⁺CD8⁺ and CD3⁺CD56⁺ T cells. With enhancement by bispecific antibodies, the mean percent lysis in a ⁵¹Cr release assay of fresh ovarian cancer cells exposed to autologous CIK cells increased from 21.7 ± 0.3% to 89.4 ± 2.1% at an E:T ratio of 100:1 (P < 0.001). Anti-NKG2D antibodies …