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Helicobacter Pylori Infection Increases the Risk of Colorectal Adenomas: an Updated Meta-Analysis by Ji-Lin Wang, Xiao Liang, Jie Xu, Ying-Xuan Chen, Jing-Yuan Fang

Background: H. pylori infection has been reported as a risk factor for colorectal adenoma (CRA); however, the clinical results were controversial. Therefore, we performed a meta-analysis to evaluate the association of H. pylori infection and CRA risk.
Methods: A comprehensive literature search for relevant studies published up to November 2017 was performed using Medline and Embase, and the statistical analysis was conducted using Stata software.
Results: A total of twenty-five studies including 8,675 cases and 15,275 controls were included in the analysis. The pooled analysis showed that H. pylori infection was associated with an increased risk of CRA (OR = 1.86, 95% CI = 1.55 - 2.23). Subgroup analyses according to the ethnicity, study type, and H. pylori detection method were further conducted. The results showed that H. pylori infection was associated with an increased risk of CRA both in Caucasian (OR = 2.23, 95% CI = 1.36 - 3.66) and Asian population (OR = 1.58, 95% CI = 1.36 - 1.82). Both the case-control studies and cross sectional studies suggested the H. pylori infection could promote the risk of CRA (case control: OR was 2.00, 95% CI = 1.22 - 3.28; cross-sectional: OR was 1.68, 95% CI = 1.43 - 1.99). For H. pylori infection detection methods, there is significant association between H. pylori infection and CRA risk using the serum IgG method and RUT, but not with the UBT and IHC method.
Conclusions: This analysis suggests that H. pylori infection may be a risk factor for CRA.

DOI: 10.7754/Clin.Lab.2018.180115