Preoperative serum carbohydrate antigen 19-9 levels predict early recurrence after the resection of early-stage pancreatic ductal adenocarcinoma

Figure 2 Receiver operating characteristic curve of serum carbohydrate antigen 19-9. A: Receiver operating characteristic (ROC) curve for carbohydrate antigen 19-9 (CA 19-9) values and early recurrence in tumor-node-metastasis (TNM) stage I patients who underwent pancreatic resection; B: ROC curve for tumor size and early recurrence in TNM stage I patients who underwent pancreatic resection. AUC: Area under the curve.