This study also reveals for the first time that the T4SS-associated adhesin, CagL, and the tyrosine kinase receptor EGFR play key roles in IL-8/IL-6 induction during H. pylori infection of endothelial cells; this not only pinpoints a novel mechanism by which the H. pylori T4SS may contribute to chronic inflammation but also highlights the importance of CagL and EGFR as therapeutic targets for treatment against chronic gastritis and gastric cancer. Here, IL6 is linked to gastric cancer.