The Promising Role of miR-21 as a Cancer Biomarker and Its Importance in RNA-Based Therapeutics
Open accessAbstract
MicroRNAs are small noncoding transcripts that posttranscriptionally regulate gene expression via base-pairing complementarity. Their role in cancer can be related to tumor suppression or oncogenic function. Moreover, they have been linked to processes recognized as hallmarks of cancer, such as apoptosis, invasion, metastasis, and proliferation. Particularly, one of the first oncomiRs found upregulated in a variety of cancers, such as gliomas, breast cancer, and colorectal cancer, was microRNA-21 (miR-21). Some of its target genes associated with cancer are PTEN (phosphatase and tensin homolog), PDCD4 (programmed cell death protein 4), RECK (reversion-inducing cysteine-rich protein with Kazal motifs), and STAT3 (signal transducer activator of transcription 3). As a result, miR-21 has been proposed as a plausible diagnostic and prognostic biomarker, as well as a therapeutic target for several types of cancer. Currently, research and clinical trials to inhibit miR-21 through anti-miR-21 oligonucleotides and ADM-21 are being conducted. As all of the evidence suggests, miR-21 is involved in carcinogenic processes; therefore, inhibiting it could have effects on more than one type of cancer. However, whether miR-21 can be used as a tissue-specific biomarker should be analyzed with caution. Consequently, the purpose of this review is to outline the available information and recent advances regarding miR-21 as a potential biomarker in the clinical setting and as a therapeutic target in cancer to highlight its importance in the era of precision medicine.
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miR-21 has been reported to be associated with GBM aggressiveness in previous studies.
“We explored miR-21 as a potential biomarker due to its reported association with GBM aggressiveness in previous studies by various research groups [8,23,24].”
From miR-21 as a diagnostic and prognostic biomarker in glioma: tissue and serum expression analysis in a Pakistani cohort (2026) · cites this paper as [24]
The miR-21 Pathways section links miR-21 to cancer-related proliferation and identifies SPRY2 as a target; the References list a study reporting that miR-21 triggers malignancy in human gliomas. These passages support an association with glioma aggressiveness, but they do not specifically establish it for glioblastoma (GBM). Page numbers were not available in our copy. (LLM, conf=0.78)
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The C. elegans heterochronic gene lin-4 encodes small RNAs with antisense complementarity to lin-14
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MicroRNA therapeutics: towards a new era for the management of cancer and other diseases
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“miR-21 as a Therapeutic Target in Clinical Trials In addition to its use as a potential biomarker in a diverse range of cancers, miR-21 has become of great interest in the field of miRNA therapeutics, an area that intends to use miRNA replacement therapy through miRNA mimics and the inhibition of miRNA function throug…”
BackgroundMicroRNA-21 contributes to myocardial disease by stimulating MAP kinase signalling in fibroblasts
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Modulation of K-Ras-Dependent Lung Tumorigenesis by MicroRNA-21
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“An in vivo study also confirmed this association, which translates to the miR-21 targeting of various genes related to apoptosis in more than one cancer and demonstrated that miR-21 is a regulator of this process.90 In the previous study, it was found that miR-21 inhibits negative regulators of the Ras/ MAPK kinase (M…”
BackgroundInfluentialConcordant Regulation of Translation and mRNA Abundance for Hundreds of Targets of a Human microRNA
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Up-regulation of miR-21 by HER2/neu signaling promotes cell invasion
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“,(76) it was found that histone posttranslational modifications such as H3K27me3 and H3K9me2 were completely absent, whereas the marks related to active transcription, H3K9-14ac, H3K4me3, and H3K27ac, were higher on the promoter of miR-21 in cell lines with an epithelial-mesenchymal transition (EMT) phenotype.(76) How…”
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“We explored miR-21 as a potential biomarker due to its reported association with GBM aggressiveness in previous studies by various research groups [8, 23, 24].”
- Authors
- Bautista-Sánchez, D., Arriaga-Canon, C., Pedroza-Torres, A., De La Rosa-Velázquez, I. A., González-Barrios, R., Contreras-Espinosa, L., Montiel-Manríquez, R., Castro-Hernández, C., Fragoso-Ontiveros, V., Álvarez-Gómez, R. M., & Herrera, L. A.
- Affiliations
- Instituto Nacional de Cancerología (MX)
- National Institute of Genomic Medicine (MX)
- Corresponding author
- Herrera, Luis A.
- ORCID
- Venue
- Molecular Therapy Nucleic Acids
- Publisher
- Elsevier BV
- Published
- 2020-06
- Volume
- 20
- Pages
- 409-420
- ISSN
- 2162-2531 (ISSN-L)
- PMC
- PMC7118281
- OpenAlex
- W3010881000
- Cited by
- 549
- References
- 7
- Citations by year
- 2026: 87 · 2025: 117 · 2024: 112 · 2023: 72 · 2022: 83 · 2021: 59 · 2020: 19
- FWCI
- 6.02
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Molecular Therapy — Nucleic Acids (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
- Funders
- National Cancer Institute of Mexico
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Keywords
- miR-21, microRNA, tumor markers, oncogenic microRNA, RNA therapeutics, anti-miR oligonucleotides, PTEN, PDCD4, RECK, STAT3, tumor suppression, metastasis, precision medicine, glioma, breast cancer, colorectal cancer
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