FROM BIOLOGICAL PLAUSIBILITY TO CLINICAL BENEFIT
Periodontitis as a Modulator of Malignant Transformation in Oral Potentially Malignant Disorders
Could periodontal inflammation influence OPMD progression? A narrative review maps the biological rationale—and the evidence still needed to establish clinical significance.
Evidence becomes more clinically demanding at every step.
Volume 28 · Article 82 · 2026
DOI: 10.1007/s11912-026-01817-z
ORIGINAL PAPER · AT A GLANCE
Volume 28 · Article 82
Periodontitis as a Modulator of Malignant Transformation in Oral Potentially Malignant Disorders: A Narrative Review of Biological Mechanisms and Clinical Implications
Pieretto · Sansavini · Cortes · Bacci
Could periodontitis help create an oral environment that favours malignant transformation—and what evidence would establish whether modifying that environment benefits patients?
This is a PerioMed-designed bibliographic presentation and critical editorial synthesis, not a reproduction of the publisher’s abstract.
THE LEARNING LENS
Biological plausibility does not automatically become clinical benefit.
Understanding how a process could occur is different from demonstrating that it predicts an outcome in patients—or showing that treatment changes that outcome.
FIRST, SEPARATE THE QUESTIONS
One hypothesis.
Three evidence thresholds.
Could it contribute?
Inflammation, dysbiosis, oxidative stress and microbial metabolites provide a biologically plausible framework.
Does it predict progression?
Independent prognostic value beyond established clinical and histopathological factors has not been demonstrated.
Does treatment help?
Periodontal treatment is appropriate for active disease, but prevention of malignant transformation remains unproven.
HOW THE PAPER WAS BUILT
A targeted search.
A narrative framework.
The authors searched English-language literature published from January 2000 to March 2026 in PubMed/MEDLINE, Scopus/EMBASE and Web of Science, supplemented by reference screening.
Its contribution is a biological and clinical framework rather than a pooled estimate of risk or a formal certainty rating. Selection based on conceptual relevance limits how confidently completeness and reliability can be judged.
THE PROPOSED BIOLOGY
Several interacting pathways could shape the oral environment.
The model is ecological and contextual. It should not be reduced to the claim that a single bacterium causes malignant transformation.
Chronic inflammation
Persistent inflammatory signalling may influence epithelial proliferation, cell survival, immune responses and tissue remodelling.
Oxidative stress
Reactive oxygen and nitrogen species may contribute to DNA damage and genomic instability.
Microbial dysbiosis
Altered microbial communities may interact with epithelial signalling and immune regulation.
Metabolic alterations
Microbial activity and its products may affect epithelial integrity, immune responses and the local tissue environment.
LOOKING BEYOND THE VISIBLE LESION
What does
field cancerization
add?
A visible lesion may sit within a wider area of mucosa containing molecular alterations. The review proposes that periodontal inflammation and dysbiosis could influence this broader environment.
This framework directs attention beyond the periodontal pocket. It does not show that periodontitis causes the altered field or determines which lesion will progress.WHERE THE EVIDENCE CHANGES
Established cancer and progression to cancer are different research questions.
A microbial pattern found in people who already have cancer cannot show that it preceded or caused malignant transformation. Cross-sectional comparisons do not demonstrate how an individual lesion changes over time, and experimental effects do not establish their magnitude or clinical importance in patients.
THREE REASONS FOR CAUTION
Before moving from a relationship to a conclusion.
Timing and direction
Dysbiosis might contribute to epithelial change, arise because of it, or interact with it in both directions.
Shared factors
Tobacco, alcohol, age, oral hygiene and socioeconomic conditions may influence the observed relationship.
Different methods
Periodontal definitions, OPMD classification, sampling sites and microbiome analyses vary substantially across studies.
WHAT THE PAPER ALLOWS US TO SAY
Four statements.
Four different interpretations.
Periodontal inflammation and dysbiosis could influence cancer-related biological pathways.
Periodontitis independently predicts malignant transformation in patients with OPMDs.
Periodontal assessment may complement a comprehensive oral examination.
Periodontal treatment prevents malignant transformation of OPMDs.
THE CLINICAL DISTINCTION
Periodontal care has a rationale.
Cancer prevention remains an unproven benefit.
Periodontal assessment may complement evaluation of lesion characteristics and histopathology, but it does not replace them. Periodontal status is not an established independent predictor of malignant transformation.
Treating active periodontitis addresses periodontal disease. A reduction in inflammation or a change in microbial composition would be informative, but neither alone demonstrates fewer malignant transformations.
The review does not provide sufficient evidence to support formal changes in clinical guidelines.TAKE THIS METHOD WITH YOU
Five questions for reading a proposed biological link.
- 01What kind of claim is being made: mechanism, association, prediction or treatment benefit?
- 02Does the evidence address the relevant disease stage?
- 03Was the proposed cause measured before the outcome?
- 04Could shared factors or reverse causation explain the findings?
- 05Did treatment improve a biological marker or the clinical outcome that matters?
PERIOMED BOTTOM LINE
“A plausible mechanism gives us a reason to investigate. Clinical benefit requires evidence that patients’ outcomes improve.”
Pieretto and colleagues provide a framework for investigating periodontitis as a possible modifier of OPMD progression while leaving causality, independent prognostic value and cancer-preventive treatment benefits unresolved.