COMPARATIVE STUDY
JOURNAL ARTICLE

Systemic immune-inflammation index for predicting prognosis of colorectal cancer

Jian-Hui Chen, Er-Tao Zhai, Yu-Jie Yuan, Kai-Ming Wu, Jian-Bo Xu, Jian-Jun Peng, Chuang-Qi Chen, Yu-Long He, Shi-Rong Cai
World Journal of Gastroenterology: WJG 2017 September 14, 23 (34): 6261-6272
28974892

AIM: To investigate the clinical significance of preoperative systemic immune-inflammation index (SII) in patients with colorectal cancer (CRC).

METHODS: A retrospective analysis of 1383 cases with CRC was performed following radical surgery. SII was calculated with the formula SII = (P × N)/L, where P, N, and L refer to peripheral platelet, neutrophil, and lymphocyte counts, respectively. The clinicopathological features and follow-up data were evaluated to compare SII with other systemic inflammation-based prognostic indices such as the neutrophil-lymphocyte ratio (NLR) and platelet-lymphocyte ratio (PLR) in patients with CRC.

RESULTS: The optimal cut-off point for SII was defined as 340. The overall survival (OS) and disease-free survival (DFS) were better in patients with low NLR, PLR, and SII ( P < 0.05). The SII was an independent predictor of OS and DFS in multivariate analysis. The area under the receiver-operating characteristics (ROC) curve for SII (0.707) was larger than those for NLR (0.602) and PLR (0.566). In contrast to NLR and PLR, SII could effectively discriminate between the TNM subgroups.

CONCLUSION: SII is a more powerful tool for predicting survival outcome in patients with CRC. It might assist the identification of high-risk patients among patients with the same TNM stage.

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