Department of Pharmacy;
Xuanwu Hospital of Capital Medical University;
National Clinical Research Center for Geriatric Diseases;
Beijing Engineering Research Center for Nervous System Drugs;
Beijing Institute for Brain Disorders;
Key Laboratory for Neurodegenerative Diseases of Ministry of Education;
Beijing 100053;
China;
College of Pharmacy;
Zunyi Medical University;
Zunyi 563000;
Guizhou Province;
China;
Gastric cancer; Gastroesophageal junction cancer; Anti-PD-1/anti-PD-L1 antibody therapy; Meta-analysis; Systematic review;