Pancreatic cancer is notoriously hard to detect early, making it one of the deadliest cancers. A groundbreaking study from NYU Langone Health, published in JAMA Oncology [1], uncovers a surprising link between the oral microbiome and pancreatic cancer risk. The bacteria and fungi in the mouth may significantly increase the risk of developing this disease. By examining this microbial ecosystem, researchers are opening new doors to early detection and prevention strategies.
The study tracked over 122,000 healthy adults from two major cohorts – the American Cancer Society Cancer Prevention Study-II Nutrition Cohort and the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial. Over nearly nine years, 445 participants developed pancreatic cancer. Their oral samples, collected via saliva, were compared to those of 445 matched cancer-free individuals using whole-genome shotgun sequencing for bacteria and internal transcribed spacer sequencing for fungi. Such large scale sequencing data strengthen evidence linking oral microbiome composition to pancreatic cancer risk.
The findings were striking. Three periodontal pathogens: Porphyromonas gingivalis, Eubacterium nodatum, and Parvimonas micra were linked to heightened pancreatic cancer risk, adding to growing evidence on oral bacteria and pancreatic cancer risk. A broader analysis identified 13 bacteria associated with increased risk and eight with decreased risk, while the fungal genus Candida also emerged as a risk factor. By combining these 27 microbial species into a microbial risk score (MRS) for pancreatic cancer, the researchers found that a one-standard-deviation increase in MRS was associated with a 3.44-fold higher odds of developing pancreatic cancer.
Why Oral Microbiome May Influence Pancreatic Cancer Risk
These results suggest that the oral microbiome, shaped by poor dental hygiene, may contribute to pancreatic cancer by fostering chronic inflammation or enabling harmful microbes to migrate to the pancreas. Importantly, the study identifies an association, not definitive causation, and the biological pathways behind this link remain under investigation. The development of the MRS offers a promising, non-invasive tool for identifying high-risk individuals, potentially revolutionizing screening approaches.
Simple steps like better oral hygiene could lower risk, highlighting the microbiome’s role in health. For those aiming to monitor their microbial health, services like Arome Science provide tools to track microbial metabolism, offering personalized insights to support prevention strategies.
