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Published in: Journal of Cancer Research and Clinical Oncology 1/2020

01-01-2020 | Rectal Cancer | Original Article – Cancer Research

High expression of microRNA-199a-5p is associated with superior clinical outcomes in patients with locally advanced rectal cancer

Authors: Dong Won Baek, Gyeonghwa Kim, Byung Woog Kang, Hye Jin Kim, Su Yeon Park, Jun Seok Park, Gyu-Seog Choi, Min Kyu Kang, Keun Hur, Jong Gwang Kim

Published in: Journal of Cancer Research and Clinical Oncology | Issue 1/2020

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Abstract

Purpose

We aimed to identify biomarkers of response to preoperative CRT in patients with LARC using comprehensive miRNA analysis.

Methods

This study included 65 rectal cancer specimens and 89 serum samples from patients diagnosed with LARC and treated with preoperative. All specimens were collected before CRT for evaluation of biologic differences between the good and poor CRT response groups (ypStage 0/I versus II/III/IV). For specific miRNA discovery, 800 miRNAs in 20 rectal cancer specimens were analyzed with a NanoString assay. For validation, a total of 65 tissue and 89 serum samples were tested with reverse transcription-polymerase chain reaction (RT-PCR).

Results

In the discovery set, 16 target miRNAs were detected. In the validation set, higher expression of three miRNAs (miR-199a/b-3p, miR-199a-5p, and miR-199b-5p) was significantly associated with better response to CRT. In the univariate survival analysis, upregulation of these three miRNAs was associated with superior relapse-free survival (RFS) and overall survival (OS). Meanwhile, only a higher level of tissue miR-199a-5p was associated with superior RFS [hazard ratio (HR), 0.0.91; 95% confidence interval (CI) 0.035–0.580; p = 0.002] and OS (HR, 0.272; 95% CI 0.023–0.658; p < 0.001) in the multivariate survival analysis. Also, a higher level of exosomal miR-199b-5p correlated with better response to CRT (p = 0.0397).

Conclusion

High expression of tissue miR-199a/b-3p, miR-199a-5p, and miR-199b-5p was significantly associated with response to CRT, and a high level of tissue miR-199a-5p was associated with superior survival outcomes. Also, upregulated exosomal miR-199b-5p correlated with CRT response, reflecting its promise as a circulating biomarker of CRT response in patients with LARC.
Literature
go back to reference Svoboda M, Izakovicova Holla L, Sefr R, Vrtkova I, Kocakova I, Tichy B, Dvorak J (2008) Micro-RNAs miR125b and miR137 are frequently upregulated in response to capecitabine chemoradiotherapy of rectal cancer. Int J Oncol 33:541–547PubMed Svoboda M, Izakovicova Holla L, Sefr R, Vrtkova I, Kocakova I, Tichy B, Dvorak J (2008) Micro-RNAs miR125b and miR137 are frequently upregulated in response to capecitabine chemoradiotherapy of rectal cancer. Int J Oncol 33:541–547PubMed
Metadata
Title
High expression of microRNA-199a-5p is associated with superior clinical outcomes in patients with locally advanced rectal cancer
Authors
Dong Won Baek
Gyeonghwa Kim
Byung Woog Kang
Hye Jin Kim
Su Yeon Park
Jun Seok Park
Gyu-Seog Choi
Min Kyu Kang
Keun Hur
Jong Gwang Kim
Publication date
01-01-2020
Publisher
Springer Berlin Heidelberg
Published in
Journal of Cancer Research and Clinical Oncology / Issue 1/2020
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-019-03099-4

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