Also, it was determined that there was a weak positive correlation between preoperative CEA value and tumor size (p = 0.008, Pearson correlation coefficient = 0.360) (Figure 1), and a strong positive correlation between preoperative CA19–9 levels and tumor size (p ≤ 0.001, Pearson correlation coefficient = 0.603 (Figure 2). The gene discussed is CEACAM5; the disease is neoplasm.