Gastric cancer (GC) is the second cause of cancer related death in the world and has a heterogenous geographic pattern of distribution (Vannella et al., 2012). Different factors have been proposed in the pathogenesis of GC including helicobacter pylori (HP) infection (Zheng et al., 2014), smoking (Zhong et al., 2012), diet (Lin et al., 2014) and family history (Mansour-Ghanaei et al., 2012). GC...