The monoclonal antibody targeting CLDN18.2 (IMAB362) has demonstrated promising clinical benefit in combination with chemotherapies for gastric cancer patients. ATG-022 demonstrated potent in vitro and in vivo antitumor effects, with in vivo efficacy observed in CLDN18.2-low expression PDX models, suggesting a promising therapeutic strategy for gastric cancer patients with a broad range of CLDN18.2 expression levels.