{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T14:11:38Z","timestamp":1789567898272,"version":"build-2803163510"},"reference-count":85,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T00:00:00Z","timestamp":1789430400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell. Infect. Microbiol."],"abstract":"<jats:p>The oral mucosa is a microbe-exposed barrier ecosystem in which surface biofilms, epithelial differentiation programs, microbial products, metabolic stress, stromal remodeling, and immune surveillance are spatially organized. Although oral microbiome studies have associated dysbiosis with oral potentially malignant disorders (OPMDs) and oral squamous cell carcinoma (OSCC), most evidence remains saliva-based, rinse-based, swab-based, tissue-homogenate-based, or taxon-centered. These approaches can identify disease-associated microbial patterns but cannot determine whether microbial signals are locally aligned with epithelial, metabolic, stromal, and immune changes within the same mucosal microdomains. Here, we propose a spatial\u2013microbial\u2013metabolic\u2013immune (SMMI) framework as an evidence-ranked and testable approach for studying malignant transformation risk in high-risk OPMDs. The acronym denotes four analytical dimensions\u2014spatial organization, microbial signals, metabolic mediation, and immune remodeling\u2014all interpreted within oral host tissue. The framework asks whether dysbiosis-associated microbial signals, epithelial barrier-response states, metabolic stress, stromal remodeling, macrophage-centered immunoregulation, altered epithelial immune visibility, and T-cell positioning become locally aligned within candidate mucosal microdomains. SMMI is a conceptual and validation framework rather than an established causal mechanism, fixed anatomical structure, or immediate therapeutic target. This article is an evidence-ranked conceptual review rather than a systematic review. We distinguish direct human OPMD evidence from OSCC-derived inference, preclinical perturbation data, broader cancer biology, methods papers, and speculative but testable hypotheses. We outline a modular validation roadmap that proceeds from pathology-anchored sampling and contamination-aware microbial localization to hypothesis-selected spatial modules, targeted functional testing, and longitudinal clinical validation. The near-term translational goal is improved risk stratification and risk-adapted surveillance, rather than ecological intervention. By reframing high-risk OPMDs as spatial oral microbe\u2013host immune-metabolic ecosystems, the SMMI framework provides a cautious structure for hypothesis generation, spatial validation, and clinically relevant risk modeling.<\/jats:p>","DOI":"10.3389\/fcimb.2026.1928595","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T10:54:02Z","timestamp":1789469642000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["A spatial\u2013microbial\u2013metabolic\u2013immune framework for high-risk oral potentially malignant disorders: an evidence-ranked review for malignant transformation risk stratification"],"prefix":"10.3389","volume":"16","author":[{"given":"Shaofu","family":"Yan","sequence":"first","affiliation":[{"name":"Shanxi Oral Health Prevention and Control Technology Innovation Center","place":["Taiyuan, Shanxi, China"]},{"name":"Shanxi Medical University School and Hospital of Stomatology","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanxin","family":"Zhang","sequence":"additional","affiliation":[{"name":"Shanxi Medical University School and Hospital of Stomatology","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenqi","family":"Tan","sequence":"additional","affiliation":[{"name":"Shanxi Oral Health Prevention and Control Technology Innovation Center","place":["Taiyuan, Shanxi, China"]},{"name":"Shanxi Medical University School and Hospital of Stomatology","place":["Taiyuan, Shanxi, China"]},{"name":"The Fifth Clinical Medical College of Shanxi Medical University","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiehua","family":"Guo","sequence":"additional","affiliation":[{"name":"Shanxi Oral Health Prevention and Control Technology Innovation Center","place":["Taiyuan, Shanxi, China"]},{"name":"Shanxi Medical University School and Hospital of Stomatology","place":["Taiyuan, Shanxi, China"]},{"name":"The Fifth Clinical Medical College of Shanxi Medical University","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinyan","family":"Si","sequence":"additional","affiliation":[{"name":"Shanxi Oral Health Prevention and Control Technology Innovation Center","place":["Taiyuan, Shanxi, China"]},{"name":"The Fifth Clinical Medical College of Shanxi Medical University","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongjiao","family":"Li","sequence":"additional","affiliation":[{"name":"Shanxi Oral Health Prevention and Control Technology Innovation Center","place":["Taiyuan, Shanxi, China"]},{"name":"The Fifth Clinical Medical College of Shanxi Medical University","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Shi","sequence":"additional","affiliation":[{"name":"Shanxi Children's Hospital, Shanxi Women and Children Health Hospital","place":["Taiyuan, Shanxi, China"]},{"name":"Shanxi Oral Health Prevention and Control Technology Innovation Center","place":["Taiyuan, Shanxi, China"]},{"name":"Shanxi Medical University School and Hospital of Stomatology","place":["Taiyuan, Shanxi, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,15]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1881","DOI":"10.1111\/odi.13810","article-title":"Malignant transformation of oral leukoplakia: systematic review and meta-analysis of the last 5 years","volume":"27","author":"Aguirre-Urizar","year":"2021","journal-title":"Oral. 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