Prognostic value of a nomogram model for pancreatic cancer incorporating the systemic immune-inflammation and prognostic nutritional indices

Figure 3 Nomogram model for predicting the 1-year, 2-year, and 3-year postoperative survival rates among patients with pancreatic ductal adenocarcinoma. The assigned scores of relevant indicators were calculated through R language based on the regression coefficients of each variable. Usually the indicator with the largest absolute value of the regression coefficient was set at 100 points, and the scores of other indicators were converted based on the relative relationship between the regression coefficients and the benchmark indicator. Prognostic nutritional index ≤ 44.45 was 100 points; systemic immune inflammation index > 335.82 was 85 points; poorly differentiated tumor was 74 points; no postoperative adjuvant chemotherapy was 81 points; and the carbohydrate antigen 19-9 level > 37 U/mL was 92 points. The calculated total score was matched with the 1-year and 3-year survival rates. The higher the total score, the lower the postoperative survival rate. CA19-9: Carbohydrate antigen 19-9; SII: Systemic immune inflammation index; PNI: Prognostic nutritional index; OS: Overall survival.