Platelet to lymphocyte ratio is a predictive marker of prognosis and therapeutic effect of postoperative chemotherapy in non-metastatic esophageal squamous cell carcinoma.

Increasing evidence has indicated that inflammatory biomarkers, including the neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ratio (PLR), and prognostic nutritional index (PNI), can be used as prognostic indicators in esophageal squamous cell carcinoma (ESCC). However, the best predictor for prognosis in ESCC remains controversial. Few studies have focused on the association between inflammatory biomarkers and postoperative chemotherapy. A cohort of 515 non-metastatic ESCC patients was retrospectively reviewed. Harrell's concordance index (c-index) was used to identify the optimal cut-off values of the inflammatory markers, and their prognostic value was compared. Cox multivariate analysis indicated that, among these inflammatory biomarkers, PLR (≥133 vs. <133) was the only independent prognostic factor for poor OS [hazard ratio = 1.370, 95% confidence intervals = 1.076-1.745, p = .011]. The c-index values of PLR were higher compared with NLR and PNI. For patients with PLR < 133, the surgery plus chemotherapy group had significantly longer OS than the surgery group alone (p = .004), but the significant difference of OS between these two groups was not observed in patients with PLR ≥ 133 (p = .624). PLR is a predictive marker of prognosis and therapeutic effect of postoperative chemotherapy in non-metastatic ESCC.