Helicobacter pylori Infection Tied to Elevated Colorectal Cancer Risk
A risk-attribution modeling study incorporating data from 43 studies found that exposure to Helicobacter pylori was associated with a 1.59-fold higher risk of colorectal cancer. The analysis estimated that up to 22% of global colorectal cancer cases could be potentially linked to H. pylori exposure, though the proportion dropped to about 12% when using only population-based and cohort studies. Limited observational evidence suggested that H. pylori eradication may reduce colorectal cancer risk, but only after 10 years of follow-up.
The modeling study, led by Shailja C. Shah, analyzed data from 43 studies and stratified results by region, diagnostic method, and eradication status. The estimated global proportion of cases linked to the bacterium varied significantly, dropping from 22% to about 12% when relying solely on population-based and cohort data.
The analysis revealed notable demographic variations. Women showed a higher estimated proportion of linked cases than men (24.8% vs 19.9%), and the proportion increased among more recent birth cohorts. Japan, Portugal, and South Korea exhibited the highest age-standardized incidence rates of potentially related colorectal cancer.
If future studies confirm a causal link, existing H. pylori screening and eradication programs could expand to address colorectal cancer risk, potentially offering dual benefits in high-prevalence regions. This may prompt healthcare systems to reassess treatment guidelines for infected individuals, particularly in resource-constrained settings where the bacterium is common. However, the exploratory nature of these findings means clinical practice should not shift immediately, as definitive causal evidence remains necessary before altering patient care protocols.