Pre-radiotherapy lymphocyte count and platelet-to-lymphocyte ratio may improve survival prediction beyond clinical factors in limited stage small cell lung cancer: model development and validation.

The P/L ratio (HR =1.002 per 1 unit, 95% CI, 1.000–1.003, P=0.003) remained significant while the ALC (HR =0.734 per 1×10 9 cells/L, 95% CI, 0.529–1.017, P=0.063) was shown to be a marginally significant predictor for OS in the combined models ( Table 2 ).

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