Abstract
Antibody drug conjugates (ADCs) are synthesized by conjugating a cytotoxic drug or “payload” to a monoclonal antibody. The payloads are conjugated using amino or sulfhydryl specific linkers that react with lysines or cysteines on the antibody surface. A typical antibody contains over 60 lysines and up to 12 cysteines as potential conjugation sites. The desired DAR (drugs/antibody ratio) depends on a number of different factors and ranges from two to eight drugs/antibody. The discrepancy between the number of potential conjugation sites and the desired DAR, combined with use of conventional conjugation methods that are not site-specific, results in heterogeneous ADCs that vary in both DAR and conjugation sites. Heterogeneous ADCs contain significant fractions with suboptimal DARs that are known to possess undesired pharmacological properties. As a result, new methods for synthesizing homogeneous ADCs have been developed in order to increase their potential as therapeutic agents. This article will review re...
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