Abtis Co. Ltd., Dong-A ST’s newly incorporated subsidiary since December 2023, is making headway with its leading Claudin18.2-targeting antibody-drug conjugate (ADC) candidate, AT-211, according to Abtis CEO Taedong Han. “About 80% of gastric cancers do not have HER2 overexpression, but 77% overexpressed Claudin18.2,” Han told Bio Korea 2024 audience members on May 9, stressing that AT-211 was found to be highly potent against cancer cells expressing Claudin18.2 in ADC cell viability studies.