The DNMT1 gene expression in the groups of patients with H. pylori cagE+, cagY+, and cagA + genotypes infection compared to patients with H. pylori cagE−, cagY−, and cagA− genotypes infection was 4.09-, 3.08-, and 3.04-fold, respectively (Table 9) (P ≤ 0.05). The gene discussed is DNMT1; the disease is infection.