Colon Cancer & Oral Bacteria
Fusobacterium nucleatum — an oral bacterium — is now recognised as a key player in colorectal cancer. F. nucleatum is enriched in colorectal tumor tissue compared to adjacent healthy tissue, drives chemotherapy resistance, and predicts worse cancer outcomes. The same strain found in tumors can be traced back to the patient's mouth.
The Connection
F. nucleatum from the oral cavity reaches the colon by hematogenous spread or by surviving stomach passage during swallowing. In the colon, it activates Wnt/β-catenin signaling, suppresses anti-tumor immunity, and shields cancer cells from chemotherapy. Oral health may turn out to be a meaningful colorectal cancer prevention lever.
Why Coordination Matters
Oncologists treating colorectal cancer should consider oral microbiome assessment, and dentists should know that aggressive periodontal treatment may have downstream cancer-prevention value.
What to Watch For
- Bleeding gums alongside any GI symptoms
- Family history of colorectal cancer plus poor oral health
Frequently Asked Questions
Can mouth bacteria cause colon cancer?
F. nucleatum, an oral bacterium, is enriched in colorectal cancer tissue and contributes to tumor progression and chemo resistance. The link is no longer hypothetical.