Variations in oral microbiota associated with oral 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 compared bacterial communities on oral squamous cell carcinoma (OSCC) lesion surfaces with anatomically matched normal mucosa. Paired samples came from the same 40 patients, removing inter-individual variation as a confound.
How was it studied?
Eighty swab samples underwent 16S rRNA gene sequencing (V4-V5 region) on an Illumina MiSeq platform. Sequences were classified to the species level against the Human Oral Microbiome Database, yielding 2,334 OTUs across 11 phyla, 130 genera and 389 species.
What did they find?
Bacterial diversity was significantly higher in cancer samples than in normal controls. A group of periodontitis-associated taxa, including Fusobacterium, Dialister, Peptostreptococcus, Filifactor, Peptococcus, Catonella and Parvimonas, was significantly enriched in OSCC samples. A cluster of Fusobacterium-associated OTUs showed good diagnostic power for distinguishing cancer from normal tissue, with an area under the ROC curve of 0.866.
Why it matters
The findings strengthen evidence linking periodontal-disease bacteria, particularly Fusobacterium, to oral cancer at the lesion surface. Species-level, paired-sample profiling adds specificity beyond earlier genus-level or unmatched-control studies.