Clinical Research Directory

Inclusion Criteria: * The patient was fully aware of the study and volunteered to participate in and signed the informed consent form (ICF); * Age≥18 years old; * Expected survival time of 3 months; * Patients with pathologically confirmed advanced gastric cancer and adenocarcinoma of the gastroesophageal junction; * Failure or intolerance of previous first-line anti-tumor therapy; * CPS 1 was detected by PD-L1 expression level; * According to RECIST1.1 criteria, the patient has at least one measurable diameter target lesion (long diameter of tumor lesion CT scan 10mm, short diameter of lymph node lesion CT scan 15mm and scanning layer thickness of 5mm); * Bone marrow function: neutrophils 1.5109 / L, platelets 100109 / L, and hemoglobin 75g / L; * The ECOG score is 0-2 points; * Liver and kidney function: upper limit of 1.5 times normal value of serum creatinine; upper limit of normal value of AST and ALT (upper limit of normal value of 5 times for patients with liver invasion); upper limit of normal value of total bilirubin (upper limit of normal value of 3 times for patients with liver invasion); * Women of childbearing age must have a negative pregnancy test (serum) within 7 days before enrollment, and must be willing to use appropriate methods for contraception during the trial; * Consent to provide the histological samples; Exclusion Criteria: * Allergic reaction to any study drug or its ingredients; * Patients with severe hepatic and renal insufficiency; * Have used a strong CYP3A4 inducer within 2 weeks before the first dose of the trial drug, or have used a strong CYP3A4 inhibitor or a strong UGT1A1 inhibitor within 1 week; * Uncontrollable systemic diseases (such as advanced infection, uncontrolled hypertension, diabetes mellitus, etc.); * Patients with intestinal obstruction and gastrointestinal bleeding; * According to the HER 2 testing process and evaluation criteria in CSCO Guidelines for Diagnosis and Treatment of Gastric Cancer 2024 edition: confirmed by immunohistochemistry (IHC), HER2 2 + accompanied by in situ hybridization with gene amplification or HER2 3 +; * Have any active autoimmune disease or a history of autoimmune disease, such as interstitial pneumonia, uveitis, enteritis, hepatitis, hypophysitis, vasculitis, myocarditis, nephritis, hyperthyroidism, and reduced thyroid function (which can be included after normal hormone replacement therapy); * Heart function and disease are one of the following: 1. Long QTc syndrome or QTc interval\> 480 ms; 2. Complete left bundle branch block, degree II or III atrioventricular block; 3. Severe, uncontrolled arrhythmias requiring medical therapy; 4. New York Society of Cardiology grade III; 5. Cardiac ejection fraction (LVEF) below 50%; 6. history of myocardial infarction, unstable angina, severe unstable ventricular arrhythmia or any other arrhythmia requiring treatment, clinically severe pericardial disease, or ECG evidence of acute ischemic or active conduction system abnormalities within 6 months prior to recruitment. * Uncontrolled ascites and abdominal cavity infection; * Active infection of hepatitis B and C (positive for HBV surface antigen and 1x103 copies / mL and 1x103 copies / mL); * Human immunodeficiency virus (HIV) infection (HIV antibody positive); * Previous or current other malignancies (except basal cell carcinoma of the skin with non-melanoma, carcinoma of the breast / cervix in situ, and other malignancies that have been effectively controlled without treatment in the past five years); * Pregnant and lactating women and patients of childbearing age who are unwilling to take contraception; * Other investigator judged ineligible for this study.