Al-Showbaki, L. et al. 2025. Anti-Programmed Cell Death-1 Versus Anti-Programmed Death-Ligand 1 (PD-L1) in PD-L1-Negative Advanced Non-Small Cell Lung Cancer: A Systematic Review and Meta-Analysis. World Journal of Oncology. (Apr. 2025). DOI:https://doi.org/10.14740/wjon2520.