CD274 and neoplasm: However, little is known about their efficacy and safety in adjuvant settings after the resection of solid tumors.<h4>Methods</h4>We performed a meta-analysis on the efficacy and safety of programmed death 1 (PD1)/PD-1 ligand (PDL1) inhibitors in adjuvant therapy after tumor resection using Review Manager 5.3, based on published clinical studies.