Regarding the gastric microbiota in subjects with gastric cancer, most studies have shown that it seems to be characterized by an enrichment of bacterial diversity due to the additional colonization of the gastric environment by oral taxa [84,87] such as Streptococcus, Staphylococcus, Lactococcus, Bacillus, Prevotella, Veillonella, and Leptotrichia, as well as intestinal taxa such as Lactobacillus [88], Clostridium and Fusobacterium, with a contemporary decreased presence of Hp [84,85,89]. The gene discussed is HP; the disease is gastric cancer.