CRP and esophageal squamous cell carcinoma: In ROC analyses, our findings revealed that the AUC was higher in CRP/PNI ratio (0.671), than GPS (0.622), CRP (0.632) or PNI (0.569), indicated that the CRP/PNI ratio was superior to other inflammation-based prognostic scores in terms of its prognostic ability in patients with ESCC.