Whereas a weak correlation was found between preoperative CEA value and tumor size (p = 0.008, Pearson correlation coefficient = 0.360) (Figure 1), preoperative CA19‐9 value was found to have a strong positive correlation with tumor size (P ≤ 0.001, Pearson correlation coefficient = 0.603) (Figure 2). The gene discussed is CEACAM5; the disease is neoplasm.