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Pharm Res. 2015 Nov;32(11):3526-40. doi: 10.1007/s11095-015-1657-7. Epub 2015 Mar 11.

Current ADC Linker Chemistry.

Author information

1
The Chemistry Research Solution, LLC, 360 George Patterson Blvd., Suite 101E, Bristol, Pennsylvania, 19007, USA. njain@tcrs-us.com.
2
The Chemistry Research Solution, LLC, 360 George Patterson Blvd., Suite 101E, Bristol, Pennsylvania, 19007, USA.

Abstract

The list of ADCs in the clinic continues to grow, bolstered by the success of first two marketed ADCs: ADCETRIS® and Kadcyla®. Currently, there are 40 ADCs in various phases of clinical development. However, only 34 of these have published their structures. Of the 34 disclosed structures, 24 of them use a linkage to the thiol of cysteines on the monoclonal antibody. The remaining 10 candidates utilize chemistry to surface lysines of the antibody. Due to the inherent heterogeneity of conjugation to the multiple lysines or cysteines found in mAbs, significant research efforts are now being directed toward the production of discrete, homogeneous ADC products, via site-specific conjugation. These site-specific conjugations may involve genetic engineering of the mAb to introduce discrete, available cysteines or non-natural amino acids with an orthogonally-reactive functional group handle such as an aldehyde, ketone, azido, or alkynyl tag. These site-specific approaches not only increase the homogeneity of ADCs but also enable novel bio-orthogonal chemistries that utilize reactive moieties other than thiol or amine. This broadens the diversity of linkers that can be utilized which will lead to better linker design in future generations of ADCs.

KEYWORDS:

ADC; ADC clinical candidates; antibody-drug conjugates; bioconjugates; linker chemistry

PMID:
25759187
PMCID:
PMC4596905
DOI:
10.1007/s11095-015-1657-7
[Indexed for MEDLINE]
Free PMC Article

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