Postoperative serum tumor markers-based nomogram predicting early recurrence for patients undergoing radical resections of pancreatic ductal adenocarcinoma

Figure 2 Nomograms based on independent risk factors for early recurrence. A: Postoperative serum tumor markers (STMs)-based nomogram for predicting early recurrence (ER). This nomogram consisted of five independent risk factors, including perineural invasion, pTNM stage III, preoperative serum carbohydrate antigen 125 (CA125) (> 13.80 U/mL), postoperative serum carbohydrate antigen 19-9 (CA19-9) (> 34.42 U/mL), and postoperative serum carcinoembryonic antigen (> 2.93 ng/mL); B: Nomogram without postoperative STMs for predicting ER. This nomogram consisted of four independent risk factors, including perineural invasion, pTNM stage III, preoperative serum CA19-9 (> 161.50 U/mL), and preoperative serum CA125 (> 13.80 U/mL). CA125: Carbohydrate antigen 125; CA19-9: Carbohydrate antigen 19-9; CEA: Carcinoembryonic antigen; RFS: Recurrence free survival.