The highest non-severely toxic dose was 5×108 CAR-T cells/kg. In the clinical case report, we present a case with unresectable advanced gastric cancer achieved pathological complete response 10 months after IMC002 infusion and no signs of recurrence were indicated in subsequent clinical and radiological follow-ups. IMC002 shows effectiveness and safety in CLDN18.2-positive gastric and pancreatic cancer and its favorable profiles support further clinical development.