Association between Helicobacter pylori antibodies determined by multiplex serology and gastric cancer risk: A meta-analysis.

Abstract

Previous studies have reported the association between limited number of Helicobacter pylori (H. pylori) antigens and gastric cancer (GC) risk. The present study evaluated the association between serum antibodies against 15 different H.pylori proteins measured by using multiplex serologyassay and GC risk. We searched PubMed databases, Embase, Web of Science, and Cochrane Library for relevant articles. A meta-analysis was used to pool studies and to estimate odds ratios (ORs) with 95% confidence intervals (95%CIs) of different H.pylori antigens associated with GC risk. Heterogeneity was investigated using Cochran's Q test and I-squared statistic. Nine studies were identified, with a total of 3209 GC cases and 6964 controls. Five H.pylori virulence factors were significantly associated with non-cardia GC risk at p-value <0.0033 including: CagA (OR=3.22, 95%CI: 2.10-4.94), HP0305 (OR=1.72, 95%CI: 1.32-2.25), HyuA (OR=1.42, 95%CI: 1.13-1.79), Omp (OR=1.83, 95%CI: 1.30-2.58), and VacA (OR=2.05, 95%CI: 1.67-2.52). However, none of the 15 antigens was associated with cardia GC risk. In subgroup analysis by ethnicity, we identified 7 antigens associated with the risk of non-cardia GC among East Asian while only two antigens were identified in European population. Nevertheless, CagA and GroEL showed a stronger association in Caucasian (CagA OR=5.83, 95%CI: 3.31-10.26; GroEL OR=3.66, 95%CI: 1.58-8.50) compared with East Asian (CagA OR=2.20, 95% CI: 1.85-2.61; GroEL OR=1.47, 95%CI: 1.29-1.68). This study determined that H.pylori infection increases the risk of non-cardia GC with differential effects by its virulence factors and with different patterns among East Asian and European populations. These results advance the understanding of the effect of H.pylori on GC.