As expected, 95.6% (481/503) of the CagA strains contained segment D. In contrast, 4.4% (22/503) contained segment C instead of segment D. Some studies showed that Western type CagA was the most frequent type in Mongolian and Russia patients and all H. pylori from gastric cancer patients possessed Western type CagA [26, 37]. The gene discussed is S100A8; the disease is gastric cancer.