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- Title
High expression of microRNA-199a-5p is associated with superior clinical outcomes in patients with locally advanced rectal cancer.
- Authors
Baek, Dong Won; Kim, Gyeonghwa; Kang, Byung Woog; Kim, Hye Jin; Park, Su Yeon; Park, Jun Seok; Choi, Gyu-Seog; Kang, Min Kyu; Hur, Keun; Kim, Jong Gwang
- 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.
- Subjects
RECTAL cancer; SURVIVAL analysis (Biometry); MULTIVARIATE analysis; UNIVARIATE analysis; MICRORNA
- Publication
Journal of Cancer Research & Clinical Oncology, 2020, Vol 146, Issue 1, p105
- ISSN
0171-5216
- Publication type
Article
- DOI
10.1007/s00432-019-03099-4