177Lu-SNA040

This clinical trial is a single-center, open-label, non-randomized, first-in-human (FIH), dose-escalation study evaluating the safety, tolerability, and preliminary efficacy of 177Lu-DOTA-SNA040 in patients with advanced Claudin18.2-positive solid tumors (e.g., gastric cancer, gastroesophageal junction adenocarcinoma, pancreatic cancer, cholangiocarcinoma, etc.) who have disease progression following first-line therapy.