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Predicting Response to Antibody Drug Conjugates: A Focus on Antigens’ Targetability
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Predicting Response to Antibody Drug Conjugates: A Focus on Antigens’ Targetability
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Journal Article
Predicting Response to Antibody Drug Conjugates: A Focus on Antigens’ Targetability
2023
Overview
Antibody-drug conjugates (ADCs) represent a cornerstone in the treatment of many cancers nowadays. ADCs fulfill their function by binding a target on tumor cell membrane to deliver a cytotoxic payload; in addition, those moieties capable of crossing cancer cell membranes can achieve near-by cells that do not express the target antigen, exerting the so-called “bystander” cytotoxic effect. The presence of a specific target antigen expressed on cancer cells has been for long considered crucial for ADCs and commonly required for the inclusion of patients in clinical trials with ADCs. To date, only ado-trastuzumab-emtansine, fam-trastuzumab deruxtecan-nxki, and mirvetuximab soravtansine-gynx are approved according to the expression of a target antigen in solid tumors, while the clinical use of other ADCs (eg, sacituzumab govitecan) is not conditioned by the presence of a specific biomarker. Given the ever-growing number of approved ADCs and those under investigation, it is essential to find new biomarkers to guide their use, especially in those settings for which different ADCs are approved to establish the best therapeutic sequence based on robust biomarkers. Hence, this work addresses the role of target antigens in predicting response to ADCs, focusing on examples of antigens’ targetability according to their expression on cancer cells’ surface or to the presence of specific target aberrations (eg, mutation or over-expression). New methods for the assessment and quantification of targets’ expression, like molecular imaging and in vitro assays, might be key tools to improve biomarker analysis and eventually deliver better outcomes by refined patient selection.
This article provides an overview of biomarkers predicting response to antibody-drug conjugates.
Publisher
Oxford University Press
