FOXP3 and gastritis: The mRNA expression of the Treg cell marker transcription factor Foxp3 was elevated in both peripheral blood and gastric mucosa of the patients infected with H. pylori (Figure 6B), and IHC detection of Foxp3 protein revealed that its expression in gastric mucosal tissues was significantly higher in the H. pylori-infected gastritis group compared to the H. pylori-negative gastritis group (Figure 6C).