Furthermore, Serelli-Lee et al reported that even after the eradication of H. pylori, the remaining Th17 cells and, hence, their induced IL-7A response may be involved in gastric cancer from the initial stages of H. pylori infection.39 Also, it is reported that IL-17A and IL-17F possess highly similar homology; however, IL-17F may possess a more prominent role in the intrinsic response than IL-17A.40 In our study, the amount of IL-17F was also increased in Hp+ patients. Here, IL17F is linked to gastric cancer.