HP and gastric cancer: Delgado et al. (2013) reported that Lactobacillus was a dominant genus in gastric mucosa and gastric juice of healthy people in Spain (Delgado et al., 2013), Gantuya et al. (2020) reported its relative abundance in the gastric mucosa of Hp-negative GC patients ranging from 35.2 to 97.0% (Gantuya et al., 2020).