Efficacy analysis and prognostic factors of first-line chemotherapy combined with immunotherapy in extensive-stage small cell lung cancer: a real-world study.

In the multivariate Cox proportional hazards model, the hazard ratio (HR) for chemotherapy alone was 1.193 (95% CI 0.956–1.490, P = 0.119), indicating that the survival difference did not reach statistical significance in this model.

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