Protease-activation using anti-idiotypic masks enables tumor specificity of a folate receptor 1-T cell bispecific antibody

The clinical application of T cell bispecific antibodies (TCBs) is often limited by the lack of tumour-specific antigens. In this study, the authors present a strategy to increase TCB tumour-selectivity by adding an anti-CD3 moiety that can be specifically activated by tumor specific proteases in the tumor microenvironment.