Published online Jul 14, 2013. doi: 10.3748/wjg.v19.i26.4242
Revised: April 3, 2013
Accepted: May 16, 2013
Published online: July 14, 2013
AIM: To investigate the association between babA2 gene and peptic ulcer disease (PUD) and gastric cancer (GC) in Helicobacter pylori-infected populations.
METHODS: We evaluated the relationship between babA2 and clinical outcomes (PUD and GC) using a meta-analysis. A literature search was performed using the PubMed and Web of Science databases for relevant case-control studies that met the defined inclusion criteria. The ORs and 95%CIs were calculated to estimate the association between babA2 genotype and clinical outcomes. A fixed-effect or random-effect model was performed depending on the absence or presence of significant heterogeneity.
RESULTS: A total of 25 articles with 38 studies met the inclusion criteria and were finally included in this meta-analysis. The results showed that the babA2 genotype was significantly associated with an increased risk of PUD (OR = 2.069, 95%CI: 1.530-2.794, P < 0.001) and especially in the subgroup of duodenal ulcer (OR = 1.588, 95%CI: 1.141-2.209, P = 0.006). Moreover, a significant association between babA2 gene and PUD and duodenal ulcer (OR = 2.739, 95%CI: 1.860-4.032, P < 0.001; OR = 2.239, 95%CI: 1.468-3.415, P < 0.001, respectively) was observed in western countries but not in Asian countries.
CONCLUSION: We demonstrated that the presence of babA2 may be associated with increased risks for PUD, especially duodenal ulcer, in western countries.
Core tip: BabA encoded by babA2 gene is an outer member protein of Helicobacter pylori (H. pylori), which plays a key role in facilitating bacterial colonization in the stomach. The association between babA2 and H. pylori-related gastroduodenal diseases is still controversial. We summarized a total of 25 case-control articles with 38 studies in this meta-analysis and evaluated the relationship between babA2 and clinical outcomes. The presence of babA2 may contribute to increased risk of peptic ulcer disease (PUD), especially duodenal ulcer, in western countries. In Asians, babA2 genotype only showed a marginal association with PUD risk, which requires further investigation.