ALDH1A1 and gastric cancer: Our analyses showed that the level of ALDH1A1 in gastric cancer was significantly correlated with depth of invasion (P < 0.001), lymph node metastasis (P < 0.001), and stage of disease (P < 0.001), but was not associated with gender, age, tumor size, tumor site and grade of differentiation (P > 0.05) (Table 1).