Increased tumor progression in patients with gastric cancer has been tied to increased peripheral blood levels of certain CD4+ T-cell subpopulations, including Th22 (CD4+IL-22+IL-17−IFN-γ−) and Th17 (CD4+IL-17+IFN-γ−) cells (Liu et al. 2012). This evidence concerns the gene IFNG and neoplasm.