Shanghai – September 20, 2026 -- Antengene Corporation Limited (SEHK: 6996.HK) has dosed the first patient in China in its pivotal Phase III CLINCH-3 study evaluating ATG-022, a CLDN18.2 antibody-drug conjugate, as monotherapy for CLDN18.2-positive advanced gastric or gastroesophageal junction adenocarcinoma.