Definition

A bispecific monoclonal antibody against both B7-H4 (V-set domain-containing T-cell activation inhibitor 1; VTCN1; B7x; B7S1) and T-cell surface antigen CD3, with potential immunostimulating and antineoplastic activities. Upon administration, anti-B7-H4/anti-CD3 bispecific antibody PF-07260437 targets and binds to both B7-H4 on the surface of tumor cells and CD3 on T cells. This results in the cross-linking of tumor cells and T cells, and induces a cytotoxic T-lymphocyte (CTL) response against B7-H4-expressing tumor cells. B7-H4, a member of the B7 family of immune modulators, is upregulated in a variety of tumor cell types and negatively regulates T-cell immune responses.