ALDH1A1 and gastric cancer: The development of gastric cancer was significantly influenced by elevated levels of ALDH1 and G-17 in gastric juice (OR= 1.095, 1.018; both P <0.05); the AUCs for the combined diagnosis of gastric cancer and elevated levels of G-17 and ALDH1 in gastric juice were 0.792, 0.757, and 0.695, respectively.