borderline significanceP=0.054
For OS, immunotherapy-containing regimen (aHR =0.48, 95% CI: 0.25–0.90; P=0.02) and ECOG-PS score (aHR =0.34, 95% CI: 0.16–0.70; P=0.004) retained prognostic significance, while chemotherapy backbone demonstrated borderline significance (aHR =0.51, 95% CI: 0.26–1.01; P=0.054).