Prognostic implications of microRNA-21 overexpression in pancreatic ductal adenocarcinoma: an international multicenter study of 686 patients

Ali, A. et al. (2022) Prognostic implications of microRNA-21 overexpression in pancreatic ductal adenocarcinoma: an international multicenter study of 686 patients. American Journal of Cancer Research, 12(12), pp. 5668-5683. (PMID:36628279) (PMCID:PMC9827095)

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Despite progress in genomic characterization, no single prognostic marker that can be evaluated using an easy-to-perform and relatively inexpensive method is available for pancreatic ductal adenocarcinoma (PDAC). MicroRNAs, which are stable, tumor- and tissue-specific molecules, are potentially ideal biomarkers, and we established an inter-laboratory validated method to investigate miR-21 as a prognostic biomarker in PDAC. The study samples of PDAC patients were recruited from a test cohort of Glasgow (n = 189) and three validation cohorts of Pisa (n = 69), Sydney (n = 249), and International Cancer Genome Consortium (ICGC) (n = 249). Tissue microarrays were used for miR-21 staining by chromogenic in situ hybridization (CISH). The patients were subdivided into no/low and high miR-21 staining groups using a specific histoscore. Furthermore, miR-21 staining was evaluated against clinicopathological variables and follow-up data by Fisher/log-rank test and Cox proportional models. The prognostic variables found to be significant in univariate analysis (P value < 0.10) were included in multivariate analysis in a backward-stepwise fashion. MiR-21 expression was cytoplasmic, with more consistent staining in the malignant ductal epithelium than in the stroma. The expression of miR-21 was significantly associated with tumor size and lymph node metastasis, whereas no association was observed with other clinicopathological variables. High miR-21 staining (histoscore ≥ 45 [median score]) was an independent predictor of survival in the Glasgow test cohort (HR 2.37, 95% CI: 1.42-3.96, P < 0.0001) and three validation cohorts (Pisa, HR 2.03, 95% CI: 1.21-3.39, P = 0.007; Sydney, HR 2.58, 95% CI (1.21-3.39), P < 0.0001; and ICGC, HR 3.34, 95% CI: 2.07-5.84, P = 0.002) when adjusted for clinical variables in a multivariate model. In comparison to the patients with low miR-21, the patients with high miR-21 expression had significant increase in OS as they benefit from gemcitabine-based adjuvant chemotherapy (Glasgow 16.5 months [with chemotherapy] vs 10.5 months [without chemotherapy]); Sydney 25.0 vs 10.6; ICGC 25.2 vs 11.9. These results indicated that miR-21 is a predictor of survival, prompting prospective trials. Evaluation of miR-21 offers new opportunities for the stratification of patients with PDAC and might facilitate the implementation of clinical management and therapeutic interventions for this devastating disease.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Duthie, Dr Fraser and Jamieson, Professor Nigel and Evans, Professor Jeff and Morton, Professor Jen and McKay, Mr Colin and Oien, Professor Karin and Chang, Professor David and Biankin, Professor Andrew and Ali, Dr Asif and Sansom, Professor Owen
Authors: Ali, A., Jamieson, N. B., Khan, I. Q., Chang, D., Giovannetti, E., Funel, N., Frampton, A.E., Morton, J., Sansom, O., Evans, T.R.J., Duthie, F., McKay, C. J., Samra, J.S., Gill, A. J., Biankin, A., and Oien, K. A.
College/School:College of Medical Veterinary and Life Sciences > School of Cancer Sciences
Journal Name:American Journal of Cancer Research
Publisher:e-Century Publishing
ISSN (Online):2156-6976
Published Online:15 December 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in American Journal of Cancer Research 12(12):5668-5683
Publisher Policy:Reproduced under a Creative Commons licence

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