Association of Oral Microbiome With Risk for Incident Head and Neck Squamous Cell CancerOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers examined whether oral microbiome composition predicts later development of head and neck squamous cell cancer (HNSCC). This nested case-control study drew on two prospective cohorts, CPS-II and PLCO, totaling 122,004 participants.
How was it studied?
Among participants who gave baseline mouthwash samples while cancer-free, 129 incident HNSCC cases were identified over an average 3.9 years of follow-up. Each case was matched to two controls (254 total) by age, sex, race/ethnicity, and sample timing. Oral bacteria were profiled by 16S rRNA gene sequencing and compared using PERMANOVA and negative binomial models, adjusting for smoking, alcohol, and oral HPV-16 status.
What did they find?
Overall oral microbiome composition was not associated with HNSCC risk. Greater abundance of the genera Corynebacterium (fold change 0.58, 95% CI 0.41-0.80) and Kingella (fold change 0.63, 95% CI 0.46-0.86) was linked to decreased HNSCC risk. These associations held across both cohorts and were stronger for larynx cancer and among people with a smoking history.
Why it matters
The authors suggest these commensal genera may lower risk partly through carcinogen metabolism capacity. The prospective design supports a temporal link between oral bacteria and later cancer risk, pointing to a possible target for prevention.