Comparison of ALDH1 levels within the gastritis groups revealed a statistically significant difference (t = -2.006, P < 0.05) between the chronic nonatrophic gastritis group (21.95 ± 17.04 ng/ml) and the chronic atrophic gastritis group (33.61 ± 27.22 ng/ml) in terms of ALDH1 levels in gastric juice. This evidence concerns the gene ALDH1A1 and gastritis.