# Oral microbiome research in cancer detection

> Live situation record from CLSTR: https://clstr.news/situations/oral-microbiome-research-in-cancer-detection
> Updated: 2026-08-22T05:48:00.000Z. Sources: 8. Developments: 3.

Researchers at Yonsei University have identified a link between oral-gut microbial transmission and the presence of gastrointestinal cancers. By utilizing a mouth-to-feces (MF) index through 16S ribosomal RNA sequencing, the study found that oral microbes colonize the digestive tracts of patients with gastric and colorectal cancers at significantly higher rates than healthy individuals or those with metabolic disorders.

In a study led by Jihyun F. Kim and published in the journal Cell Host & Microbe, researchers analyzed 507 volunteers to identify distinct microbial signatures. The findings suggest that patterns in oral microbial communities differ based on health status, potentially allowing saliva-based screening to serve as a less invasive alternative to traditional stool samples for detecting gastrointestinal carcinomas. The research indicates that the MF index remains a consistent metric even when accounting for factors such as alcohol consumption, exercise, and body mass index.

## Timeline

### 2026-08-22: Yonsei University researchers find saliva may detect cancer signs

A study published in Cell Host & Microbe suggests that saliva-based screening could detect early signs of stomach and colorectal cancer by analyzing oral microbial patterns.

3 sources. https://clstr.news/cluster/yonsei-university-researchers-find-saliva-may-detect-cancer-signs

### 2026-08-21: Oral microbiome research advances cancer detection and bacterial control

New research highlights the role of oral microbes in detecting gastrointestinal cancers and the development of a specialized chewing gum to selectively eliminate cancer-linked bacteria and viruses.

2 sources. https://clstr.news/cluster/oral-microbiome-research-advances-cancer-detection-and-bacterial-control

### 2026-08-20: Yonsei University study links oral-gut microbial transmission to cancer

Yonsei University researchers found that a mouth-to-gut microbial transmission index can help distinguish gastric and colorectal cancer patients from healthy individuals.

3 sources. https://clstr.news/cluster/yonsei-university-study-links-oral-gut-microbial-transmission-to-cancer

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Cite as: Oral microbiome research in cancer detection. CLSTR, https://clstr.news/situations/oral-microbiome-research-in-cancer-detection