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Dysplasia and DNA ploidy to prognosticate clinical outcome in oral potentially malignant disorders

Lookup NU author(s): Dr Hans Sathasivam, Professor Philip Sloan, Professor Peter Thomson

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Abstract

© 2020 John Wiley & Sons A/S. Published by John Wiley & Sons LtdBackground: Oral potentially malignant disorders are a clinical conundrum as there are no reliable methods to predict their behaviour. We combine conventional oral epithelial dysplasia grading with DNA ploidy analysis to examine the validity of this approach to risk assessment in a cohort of patients with known clinical outcomes. Methods: Sections from diagnostic biopsies were assessed for oral epithelial dysplasia using the WHO grading system, and DNA ploidy analysis was performed using established methods. Patients reviewed for a minimum of 5 years who did not develop oral squamous cell carcinoma were classified as “non-transforming” cases. Patients that developed oral squamous cell carcinoma ≥ 6 months after the initial diagnostic biopsy were classified as having “malignant transformation.”. Results: Ninety cases were included in the study. Seventy cases yielded informative DNA ploidy results. Of these 70 cases, 31 progressed to cancer. Oral epithelial dysplasia grading and DNA ploidy status were both significantly associated with clinical outcome (P < 0.05). Severe dysplasia had a hazard ratio of 3.50 (CI: 1.46, 8.45; P = 0.005) compared to cases with mild dysplasia. Aneuploidy had a hazard ratio of 2.09 (CI: 1.01, 4.32; P = 0.046) compared to cases with a diploid/tetraploid status. Receiver operating characteristic analysis gave an area under the curve of 0.617 for DNA ploidy status and 0.688 when DNA ploidy status was combined with dysplasia grading. Conclusion: Our findings suggest that combining dysplasia grading with DNA ploidy status has clinical utility which could be used to develop novel management algorithms.


Publication metadata

Author(s): Sathasivam HP, Nayar D, Sloan P, Thomson PJ, Odell EW, Robinson M

Publication type: Article

Publication status: Published

Journal: Journal of Oral Pathology and Medicine

Year: 2020

Volume: 50

Issue: 2

Pages: 200-209

Print publication date: 01/02/2021

Online publication date: 05/11/2020

Acceptance date: 12/09/2020

ISSN (print): 0904-2512

ISSN (electronic): 1600-0714

Publisher: Blackwell Publishing Ltd

URL: https://doi.org/10.1111/jop.13121

DOI: 10.1111/jop.13121

PubMed id: 33151583


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