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Target Antigen Attributes and Their Contributions to Clinically Approved Antibody-Drug Conjugates (ADCs) in Haematopoietic and Solid Cancers

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Simple Summary Antibody-Drug Conjugates (ADCs) provide effective anti-cancer treatments. ADC development requires the identification of appropriate tumour-associated antigens that can be targeted by the ADC to effectively kill cancer cells… Click to show full abstract

Simple Summary Antibody-Drug Conjugates (ADCs) provide effective anti-cancer treatments. ADC development requires the identification of appropriate tumour-associated antigens that can be targeted by the ADC to effectively kill cancer cells while minimising damage to healthy cells, thus limiting systemic toxicities. In this review, we examine the attributes of the antigens targeted by the anticancer ADCs that are clinically approved, and consider how these features may contribute to the safety and effectiveness of ADC therapeutics. Abstract Antibody drug conjugates (ADCs) are powerful anti-cancer therapies comprising an antibody joined to a cytotoxic payload through a chemical linker. ADCs exploit the specificity of antibodies for their target antigens, combined with the potency of cytotoxic drugs, to selectively kill target antigen-expressing tumour cells. The recent rapid advancement of the ADC field has so far yielded twelve and eight ADCs approved by the US and EU regulatory bodies, respectively. These serve as effective targeted treatments for several haematological and solid tumour types. In the development of an ADC, the judicious choice of an antibody target antigen with high expression on malignant cells but restricted expression on normal tissues and immune cells is considered crucial to achieve selectivity and potency while minimising on-target off-tumour toxicities. Aside from this paradigm, the selection of an antigen for an ADC requires consideration of several factors relating to the expression pattern and biological features of the target antigen. In this review, we discuss the attributes of antigens selected as targets for antibodies used in clinically approved ADCs for the treatment of haematological and solid malignancies. We discuss target expression, functions, and cellular kinetics, and we consider how these factors might contribute to ADC efficacy.

Keywords: clinically approved; drug conjugates; conjugates adcs; target antigen; antibody drug

Journal Title: Cancers
Year Published: 2023

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