Bioanalytical study demonstrates sensitive quantitation of site-specific conjugated payload in human serum, highlighting its utility for clinical pharmacokinetics.
BACKGROUND: Quantitating antibody drug conjugates (ADCs) with traditional ligand binding assays (LBAs) requires cytotoxic payload targeting reagents, which may be needed for ADC capture/detection. LBAs are drug antibody ratio insensitive (DAR insensitive) and prone to under- or over-estimating DAR species. METHODS: This hybrid LBA LC MS/MS assay measures concentrations for a novel ADC drug (BMS-X) with an engineered, site‑specific, non-cleavable linker, and a unique payload. Recombinant target protein-extracellular domain fused with mouse IgG-Fc was used for ADC pull down in human serum. Pepsin digestion released unique toxin linker peptide complexes for two conjugation sites. RESULTS AND CONCLUSIONS: This novel, validated DAR-sensitive hybrid-LCMS PK assay measured payload-conjugated BMS-X levels in human serum, quantitated surrogate analytes for both unique conjugation sites, and was used to support a first-in-human clinical trial.
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Xue et al. (2026) studied this question.
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