A DAR sensitive hybrid LBA-LC-MS/MS assay for quantitation of conjugated payload from a non-cleavable ADC in human serum.
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 Thi...