...Previous tumor samples or fresh tumor tissue biopsy samples can be provided, and any of the following biomarkers are confirmed positive by the central laboratory: 1)PD-L1 positive: defined as PD-L1 staining positive at any intensity in ≥5% tumor cells (TC) or ≥10% immune cells (IC); 2)Epstein-Barr virus (EBV) positive: defined as positive for EBV-encoded small RNA in situ hybridization (EBER-ISH); 3)Tumor mutation burden-high (TMB-H): tumor tissues will be detected by whole exome sequencing (WES), with tumor mutation burden ≥12 Muts/Mb; 4)Microsatellite instability-high (MSI-H): Tumor tissue is tested by whole exome sequencing (WES) to confirm MSI-H positivity; 6....