Figure 1 ROC curve for NLR in predicting PFS. The cut-off value was determined to be 3.63 (AUC=0.609 [95% CI: 0.535–0.679]; P=0.011). NLR threshold level >3.63 at diagnosis could predict PFS with 39.44% sensitivity and 81.9% specificity. AUC – the area under the curve; NLR – neutrophil-to-lymphocyte ratio; ROC – receiver operating characteristic; PFS – progression-free survival. We used SPSS 23.0 software package (IBM Corp., Armonk, NY) to draw this figure.