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Mechanistic Projection of First-in-Human Dose for Bispecific Immunomodulatory P-Cadherin LP-DART: An Integrated PK/PD Modeling Approach.
Clinical Pharmacology and Therapeutics 2016 September
A bispecific immunomodulatory biotherapeutic molecule (P-cadherin LP-DART) based on the Dual Affinity Re-Targeting (DART) scaffold has been developed as a potential antitumor treatment showing efficacy in preclinical testing. A minimal anticipated biological effect level (MABEL) approach was applied to project the first-in-human (FIH) dose, because of its immune agonistic properties following target engagement. The pharmacological activity of P-cadherin LP-DART is driven by binding to both P-cadherin on the tumor cells and CD3 on T cells. Therefore, the concentration of the tri-molecular synapse formed between drug, T cell, and tumor cell, rather than drug concentration, is responsible for efficacy. A mechanistic pharmacokinetic/pharmacodynamic (PK/PD)-driven approach was explored to understand the exposure-response relationship based on the synapse concentration to project the MABEL dose. Orthogonal approaches including PK-driven and receptor occupancy calculations were also investigated. This study showcases the application of PK/PD modeling in immune-oncology, and could potentially be implemented for other bispecific biotherapeutics.
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