CEACAM5 and digestive system neoplasm: The data presented in Table 4 demonstrates a direct correlation between the plasma SIRT1 level in patients with gastric cancer and the commonly used gastrointestinal tumor markers CEA (r = 0.255, p = 0.039), CA125 (r = 0.260, p = 0.035), and CA724 (r = 0.268, p = 0.030).