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JO-4 is a recombinant protein drug candidate designed to transiently open intercellular junctions in epithelial tissues by binding and modulating desmoglein 2. Its mechanism of action is to facilitate the access of co-administered anti-cancer agents, notably monoclonal antibodies or chemotherapeutics, into solid tumors by increasing tissue permeability. JO-4 is under investigation as an adjunct to cancer therapy to improve drug delivery, with preclinical and early-phase clinical studies showing promise for enhanced efficacy of biologics and chemotherapy in solid tumors.
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