Fig. 3From: Preoperative serum CA19-9 should be routinely measured in the colorectal patients with preoperative normal serum CEA: a multicenter retrospective cohort studyKaplan‐Meier curves for recurrence-free survival according to the preoperative CA19-9 group. (a) overall population. (b) patients with normal preoperative CEA. (c) patients with elevated preoperative CEA. CA19-9, carbohydrate antigen 19–9; CEA, carcinoembryonic antigenBack to article page