Prognostic nutritional index and colorectal cancer deaths: A retrospective cohort study in Chinese patients with locally advanced colorectal cancer.

e15160 Background: The nutrition and immune status-based scoring system PNI was originally used to assess the nutritional status and surgical risk of surgical patients before surgery. Subsequent studies have shown that PNI is an important prognostic indicator for some malignant tumors, including hepatocellular carcinoma, pancreatic cancer, laryngeal cancer, renal cell carcinoma and gastric cancer. We speculated that since PNI is associated with the prognosis of other malignancies, is it also relevant in colorectal cancer? In view of the obvious increase in the incidence of colorectal cancer in China, and the clinical progress of colorectal cancer in the entire colorectal cancer accounted for up to 70% and current studies on PNI and local advanced colorectal cancer prognosis association study in Chinese is limited. In the present study, our primary objective was to explore whether PNI evaluated at baseline was independently associated with colorectal cancer deaths after controlling other potential confounders. Methods: Through a retrospective cohort study, we analyzed the clinical data of 400 patients with pathologically confirmed colorectal cancer and radical resection of colorectal cancer from January 2013 to April 2018.The exposure variable was PNI at baseline, the outcome variable was death, and other covariates of this study include: Continuous variables: age, platelet count, tumor markers (CEA, CA199, CA724, CA242).Categorical variables: gender, survival status, tumor location, histological type, degree of differentiation, TNM staging, and postoperative treatment. Results: Fully-adjusted model demonstrated that PNI was not associated with deaths of local advanced colorectal cancer and radical resection of colorectal cancer (HR = 0.88; 95% CI, 0.78-1.00). By applying the cubic spline function to the model, we found that the relationship between PNI and death is nonlinear.Two-piecewise cox model suggested that On the left side of the inflection point (41.35), PNI per 1 change is associated with the 68% decrease of risk of deaths (HR = 0.32; 95% CI, 0.13-0.79), to the right of the inflection point, PNI and death The association is not detected. Conclusions: PNI and deaths are nonlinearity, and within a certain range (PNI = 26-41), PNI is an independent protective factor for death risk.