Epidemiology and risk of colorectal cancer in patients with a history of Helicobacter pylori infection: a population-based study

Background Numerous modifiable risk factors have been associated with colon cancer. Helicobacter pylori (H. pylori) is the most common bacterial infection worldwide and the strongest known risk factor for gastric cancer. We aim to assess whether the risk of colorectal cancer (CRC) is higher in patients with a history of H. pylori infection.Methods A validated multicenter and research platform database of more than 360 hospitals was queried. Patients aged 18-65 years were included in our cohort. We excluded all patients who had previously had a diagnosis of inflammatory bowel disease or celiac disease. Univariate and multivariate regression analyses were used to calculate CRC risk.Results A total of 47,714,750 patients were selected after application of the inclusion and exclusion criteria. The 20-year-period prevalence rate of CRC in the United States population from 1999 to September 2022 was 370 of 100,000 individuals (0.37%). According to multivariate analysis, the risk of CRC was higher in smokers (odds ratio [OR] 2.52, 95% confidence interval [CI] 2.47-2.57), obese patients (OR 2.26, 95%CI 2.22-2.30), those with irritable bowel syndrome (OR 2.02, 95%CI 1.94-2.09), or type 2 diabetes mellitus (OR 2.89, 95%CI 2.84-2.95), and patients who had a diagnosis of H. pylori infection (OR 1.89, 95%CI 1.69-2.10).Conclusion We provide the first evidence from a large population-based study demonstrating an independent association between a history of H. pylori infection and CRC risk.