Novel tumor marker index combining carcinoembryonic antigen and carbohydrate antigen 19-9: New prognostic factor for metastatic colorectal cancer

Figure 1 Receiver operating characteristic curve and Kaplan-Meier curves. A: Receiver operating characteristic curve analysis for determining optimal cut-off values of tumor marker index and neutrophil-to-lymphocyte ratio; B: Kaplan-Meier curves for progression-free survival in high-tumor marker index and low-tumor marker index groups; C: Kaplan-Meier curves for overall survival in high-tumor marker index and low-tumor marker index groups. ROC: Receiver operating characteristic; TMI: Tumor marker index; NLR: Neutrophil-to-lymphocyte ratio; PFS: Progression-free survival; OS: Overall survival.