This study aims to evaluate the safety and tolerability of JPI-547 in combination with irinotecan as a third-line and beyond therapy for recurrent or metastatic gastric cancer

Inclusion Criteria:

• Patients with recurrent or metastatic gastric or gastroesophageal junction (GEJ) adenocarcinoma who have progressed after second-line therapy.
• Those with Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1
• Those with at least one measurable lesion in accordance with RECIST 1.1

Exclusion Criteria:

• Patients with a confirmed specific medical history or past surgical history
• Patients who meet specific criteria regarding prior treatment
• Patients with a history of specific drug administration
• Patients with specific comorbidities.
• Patients who have undergone major surgery within 4 weeks prior to screening or are expected to require major surgery during the clinical trial are excluded. (However, those who have had minor surgeries
• Patients with symptoms at the time of screening, who have not received treatment, or who have rapidly progressing central nervous system (CNS) metastases.
• Patients with mental disorders or altered mental status/consciousness (AMS) that impair their ability to understand this clinical trial for informed consent.
• Pregnant or Lactating Women
• Subjects with a history of severe allergic anaphylactic reactions to the investigational product and/or its components, or who have contraindications to the administration of the investigational product and/or irinotecan
• Patients considered unsuitable for this clinical trial by the investigator.