RecruitingPhase 2Drug trialTesting Ivonescimab in Combination With Chemotherapy in Advanced or Metastatic Gastric/Gastroesophageal AdenocarcinomaThe goal of this clinical trial is to evaluate the addition of ivonescimab to standard chemotherapy in patients with advanced or metastatic gastric and gastroesophageal adenocarcinoma. The main question it aims to answer is : Does the addition of ivonescimab increase the response to treatment ? Participants will visit the clinic every 2 weeks for checkups, treatment administration and tests for collection of adverse events.