Antibody–drug conjugates (ADCs) represent an emerging class of cancer chemotherapy agents. The striking success of ADCs, as demonstrated with 4 FDA-approved ADCs and more than 60 ADCs in clinical trials, has inspired scientists and clinicians to further advance this molecular format towards effective therapeutics for cancers. ADCs enable pinpoint delivery of highly potent antitumor drugs selectively to tumor cells while avoiding healthy tissues. The ADC chemical linker between the antibody and the drug molecule critically impacts ADC potency, safety, and durability profiles. Thus, the use of proper ADC linkers is a key to successfully implement ADC-based chemotherapy. Our primary interest is in developing novel ADC linker technologies by taking advantage of the power of organic chemistry, medicinal chemistry, and chemical biology. One example is branched ADC linkers that can be equipped with multiple drug molecules. Most ADC linkers developed to date accommodate only single cytotoxic drugs. The clinical potential of such multiloading ADC linkers had remained unexplored because of the lack of efficient and versatile methods. We developed efficient methods for installing dual-loading ADC linkers in a simple and quantitative manner. Based on this success, we are currently advancing the multi-loading strategy to produce next-generation ADCs for combating the cancer drug resistance and heterogeneity. These are unsolved issues in cancer chemotherapy leading to discontinuation of medication and recurrence of malignancy. We envisage that our ADC technologies will provide innovative approaches for overcoming such unsolved issues and establish a novel technology platform providing a number of valuable additions to the current list of drug candidates for the future clinical studies.
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