1805 (26.3%) were excluded from the analysis for the following reasons: stage I (n = 1405), 85 years of age or older (n = 32), a history of cancer within 5 years prior to surgery (n = 87), residual tumor after surgery (n = 19), no preoperative CEA data (n = 103), no preoperative CA19-9 data (n = 150), and loss to follow-up (n = 9) (Fig. 1). Here, CEACAM5 is linked to cancer.