Antengene Corporation Ltd. has announced new clinical data from the ongoing Phase I/II CLINCH study of ATG-022, a Claudin 18.2 antibody-drug conjugate $(ADC)$, in patients with advanced gastric and gastroesophageal junction cancer. The results were presented in a poster session at the European Society for Medical Oncology Congress 2025 (ESMO 2025) in Berlin. The study demonstrated efficacy across all CLDN18.2 expression levels, with three complete responses observed across different dose cohorts, including those with low or ultra-low CLDN18.2 expression. Safety data from the 2.4 mg/kg cohort indicated a favorable profile, with the lower 1.8 mg/kg cohort showing even better tolerability. ATG-022 has received two Orphan Drug designations from the U.S. FDA and Breakthrough Therapy Designation from China's NMPA for specific gastric cancer indications. Dose expansion studies are ongoing in China and Australia, with preparations underway for combination therapy trials.