Helicobacter pylori linked to over 20% of colorectal cancer cases worldwide

A recent exploratory risk‑attribution study published in *eGastroenterology* indicates that exposure to the stomach bacterium *Helicobacter pylori* may be linked to more than one in five cases of colorectal cancer worldwide. The analysis, which examined epidemiological data across multiple populations, found a statistically significant association between H. pylori infection and the incidence of colorectal malignancies, suggesting a potential role for this common gastric pathogen in colorectal carcinogenesis.

The study highlights that H. pylori, traditionally associated with peptic ulcer disease and gastric cancer, may also contribute to colorectal tumor development through mechanisms such as chronic inflammation, immune modulation, and alterations in gut microbiota. While the research is preliminary and observational, it underscores the need for further investigation into how H. pylori infection could influence colorectal cancer risk and whether screening or eradication strategies might impact long‑term outcomes.

If future studies confirm these findings, clinicians may consider H. pylori status when assessing colorectal cancer risk, and public health initiatives could incorporate bacterial screening into colorectal cancer prevention programs. Continued research will be essential to clarify causality, identify underlying biological pathways, and evaluate the potential benefits of targeted interventions.