Bispecific antibody has being actively pursued in cancer immunotherapy. By binding to specific surface proteins on T cells or NK cells, bispecific antibodies recruit T cells or NK cells to close proximity of tumor cells and kill tumor cells. A number of bispecific antibodies with diverse formats have been developed and some of them already in clinical stages. In the study of "Her2-S-Fab bispecific antibody has potent cytotoxicity against Her2-expressing tumor cells", a novel format of

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... antibody was reported. Here we briefly describe this study and its implications in cancer immunotherapy.