The FAST study enrolled advanced gastric/gastro-oesophageal junction (G/GEJ) and oesophageal adenocarcinoma (EC) patients (≥18 years) with moderate-to-strong CLDN18.2 expression in ≥40% tumour cells….zolbetuximab+EOX...In the overall population, both PFS (HR=0.44; 95% CI, 0.29–0.67; P<0.0005) and OS (HR=0.55; 95% CI, 0.39–0.77; P<0.0005) were significantly improved with zolbetuximab+EOX (Arm 2) compared with EOX alone (Arm 1).