RecruitingDrug trialUtidelone Capsule Combined With Fluoropyrimidine- and Platinum-containing Therapy in First-line Treatment of Patients With Gastric or Gastroesophageal Junction AdenocarcinomaThis is a multi-national, open-label, randomized, seamless phase II/III clinical study of UTD2 combined with fluoropyrimidine- and platinum-containing therapy to evaluate the efficacy and safety in patients with locally advanced or metastatic gastric or gastroesophageal junction adenocarcinoma untreated with systemic treatment in advanced setting.