In addition, Kaplan-Meier analysis demonstrated that ALDH1A1 overexpression (P < 0.001), larger tumor size (P = 0.001), tumor site (P = 0.047), prominent serosal invasion (P < 0.001) and lymph node metastasis (P < 0.001) were negative prognostic factors for RFS in gastric cancer patients (Table 2). Here, ALDH1A1 is linked to gastric cancer.