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Updated: Mar 14, 2026

MicroRNA Amplification and Recognition through Locked-nucleic-acid In situ Hybridization as a Novel Detection and Quantification Method
Published on: October 7, 2025
Emerging role of microRNA-21 in cancer
Yin-Hsun Feng1, Chao-Jung Tsao2
1Division of Hematology and Oncology, Department of Internal Medicine, Chi-Mei Medical Center, Tainan 71004, Taiwan, R.O.C.; Department of Nursing, College of Medicine and Life Science, Chung Hwa University of Medical Technology, Tainan 71703, Taiwan, R.O.C.
Abstract:
MicroRNAs (miRs) are a class of single-stranded RNA molecules of 15-27 nucleotides in length that regulate gene expression at the post-translational level. miR-21 is one of the earliest identified cancer-promoting 'oncomiRs', targeting numerous tumor suppressor genes associated with proliferation, apoptosis and invasion. The regulation of miR-21 and its role in carcinogenesis have been extensively investigated. Recent studies have focused on the diagnostic and prognostic value of miR-21 as well as its implication in the drug resistance of human malignancies. The further use of miR-21 as a biomarker and target for cancer treatments is likely to improve the outcome for patients with cancer. The present review highlights recent findings associated with the importance of miR-21 in hematological and non-hematological malignancies.
Insights
MicroRNAs (miRs), specifically miR-21, are key regulators in cancer development. This review explores miR-21
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- MicroRNAs (miRs) are small, non-coding RNA molecules that regulate gene expression post-transcriptionally.
- miR-21 is identified as an 'oncomiR', promoting cancer by targeting tumor suppressor genes involved in cell proliferation, apoptosis, and invasion.
- Extensive research has investigated miR-21's role in various cancers.
Purpose of the Study:
- To review recent findings on the significance of miR-21 in both hematological and non-hematological malignancies.
- To highlight the diagnostic and prognostic potential of miR-21.
- To discuss the role of miR-21 in drug resistance and its potential as a therapeutic target.
Main Methods:
- Literature review of recent studies focusing on miR-21.
- Analysis of research investigating miR-21's function in cancer cell biology.
- Synthesis of data regarding miR-21's clinical relevance.
Main Results:
- miR-21 plays a crucial role in the development and progression of various cancers.
- miR-21 demonstrates significant potential as a biomarker for cancer diagnosis and prognosis.
- miR-21 is implicated in acquired resistance to cancer therapies.
Conclusions:
- miR-21 is a critical factor in human malignancies, influencing carcinogenesis and therapeutic responses.
- Targeting miR-21 offers a promising strategy for improving cancer treatment outcomes.
- Further research into miR-21's functions may lead to novel diagnostic and therapeutic applications in oncology.
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