Research suggests that metabolites from the bacteria Streptococcus anginosus, which is found in the mouth, may contribute to the development of gastric cancer. The connection between oral bacteria and gastric health is an area of ongoing study, with some research exploring the potential for salivary biomarkers to aid in early detection of gastric cancer. The relationship between the microbiome and gastric cancer progression is not yet fully understood and is the subject of continued investigation.