Abstract
Background
This study was undertaken to develop and validate a gene expression signature that characterises oral potentially malignant disorders (OPMD) with a high risk of undergoing malignant transformation.
Methods
Patients with oral epithelial dysplasia at one hospital were selected as the ‘training set’ (n = 56) whilst those at another hospital were selected for the ‘test set’ (n = 66). RNA was extracted from formalin-fixed paraffin-embedded (FFPE) diagnostic biopsies and analysed using the NanoString nCounter platform. A targeted panel of 42 genes selected on their association with oral carcinogenesis was used to develop a prognostic gene signature. Following data normalisation, uni- and multivariable analysis, as well as prognostic modelling, were employed to develop and validate the gene signature.
Results
A prognostic classifier composed of 11 genes was developed using the training set. The multivariable prognostic model was used to predict patient risk scores in the test set. The prognostic gene signature was an independent predictor of malignant transformation when assessed in the test set, with the high-risk group showing worse prognosis [Hazard ratio = 12.65, p = 0.0003].
Conclusions
This study demonstrates proof of principle that RNA extracted from FFPE diagnostic biopsies of OPMD, when analysed on the NanoString nCounter platform, can be used to generate a molecular classifier that stratifies the risk of malignant transformation with promising clinical utility.
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Acknowledgements
We would like to acknowledge Ms. Anastasia Resteu from the Newcastle NanoString Unit, Newcastle University, for assisting with the NanoString assay.
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Contributions
H.P.S. conceived and designed the study, performed experiments, analysed data, carried out statistical analysis and wrote major parts of the manuscript. R.K. participated in study design, provided expert advice, performed experiments, interpreted results and edited the manuscript. P.S. participated in study design, provided expert advice, performed dysplasia grading, contributed to retrieval of tissue, interpreted results and edited the manuscript. P.T. and M.N. contributed to case selection, retrieval of follow-up data, quality assurance of data, interpreted results and edited the manuscript. J.A. and S.H. contributed to study design, analysed data, carried out statistical analysis, quality assurance of results, interpreted results and wrote major parts of the manuscript. M.R. conceived and designed the study, provided expert advice, performed dysplasia grading, contributed to retrieval of tissue, analysed data, interpreted results and wrote major parts of the manuscript. All authors read and approved the final manuscript.
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The study was performed with approval from a Health Research Authority (UK) Research Ethics Committee (North East—Tyne and Wear South Research Ethics Committee; NRES Committee North East—Sunderland 11/NE/0118) and complies with UK legislation and guidelines. Patients were not recruited to the study and therefore individual patient consent was not sought. Link-anonymised patient tissue samples, surplus to diagnostic requirements, were analysed in accordance with the terms of the ethical approval. The study was performed in accordance with the Declaration of Helsinki.
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The datasets used and/or analysed during the current study are available at https://doi.org/10.5281/zenodo.4643470.
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The authors declare no competing interests.
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H.P. Sathasivam was supported by scholarship from Ministry of Health Malaysia. S.H. is supported by Breast Cancer Now as part of Programme Funding to The Breast Cancer Now Toby Robins Research Centre.
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Sathasivam, H.P., Kist, R., Sloan, P. et al. Predicting the clinical outcome of oral potentially malignant disorders using transcriptomic-based molecular pathology. Br J Cancer 125, 413–421 (2021). https://doi.org/10.1038/s41416-021-01411-z
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DOI: https://doi.org/10.1038/s41416-021-01411-z
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