Helicobacter Pylori Infection and Increased Diabetes Prevalence Were the Risks of Colorectal Adenoma: a Systematic Review and Meta-Analysis

BackgroundHelicobacter pylori (H. Pylori) infection and hyperglycemia may be associated with an increased risk of colorectal neoplasm. However these two factors affect colorectal neoplasm remain controversial. We aimed to carry out a meta-analysis to evaluate the study population diabetes prevalence rate and H. pylori infection rate with colorectal adenoma risk.MethodsWe conducted a systemic research through English databases for medical reports. We also recorded the diabetes prevalence and H. pylori infection prevalence in each study. We classified these studies into 4 subgroups as their background population diabetes prevalence < 6%(Group 1); between 6 to 8%(Group 2); between 8 to 10%(Group 3) and more than 10%(Group 4). The random effects model had used to calculate pooled prevalence estimates with 95% confidence interval [CI].ResultsTwenty seven studies were finally eligible for meta-analysis. The random-effects model of meta-analysis was chosen, showing pooled odds ratio (OR) equal to 1.51 (95% CI 1.39–1.63). The subgroup meta-analyses showed in Group 1 the H. pylori infection associated colorectal adenoma risk OR was 1.24 (95% CI 0.86–1.78). As diabetes rate exceed 6%, the H. pylori infection became more significant increased risk of colorectal adenoma (Group 2: OR 2.16 (95% CI 1.61–2.91); Group 3: OR 1.40 (95% CI 1.24–1.57); Group 4: OR 1.52 (95% CI 1.46–1.57)).ConclusionsThe results of this meta-analysis showed DM prevalence would affect the risk factor of colorectal adenoma with H. pylori infection.