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MiR-21 overexpression in human primary squamous cell lung carcinoma is associated with poor patient prognosis

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Journal of Cancer Research and Clinical Oncology Aims and scope Submit manuscript

Abstract

Purpose

This study compared miRNA expression patterns in primary squamous cell lung carcinoma specimens with those of matched normal lung tissue in order to determine their potential relevance to clinicopathological factors and patient postoperative survival times.

Methods

Locked nucleic acids miRNA microarray expression profiling was performed on four matched pairs of tissues. After microarray validation by quantitative real-time reverse transcription polymerase chain reaction assays (qRT-PCR) (real-time PCR), miR-21 was selected for further TaqMan real-time PCR study in 30 matched tissue pairs.

Results

Seven miRNAs of hsa-miR-21, hsa-miR-31, hsa-miR-34a, hsa-miR-22*, hsa-miR-504, hsa-miR-18a, and hsa-miR-412 were observed to be upregulated greater than twofold in the squamous cell lung carcinoma tissues compared with normal tissues, whereas 23 miRNAs of hsa-miR-30a, hsa-miR-30d, hsa-miR-126, hsa-miR-652, hsa-miR-100, hsa-miR-143, hsa-miR-130a, hsa-miR-145, hsa-miR-30e, hsa-miR-126*, hsa-miR-181a, hsa-miR-125b, hsa-miR-886-3p, hsa-miR-451, hsa-miR-29c, hsa-miR-26b, hsa-miR-101, hsa-miR-320, hsa-miR-30b, hsa-miR-886-5p, hsa-miR-29a, hsa-miR-26a, and hsa-miR-99a were found to be downregulated greater than twofold. MiR-21 was overexpressed in 73.3% of the squamous cell lung carcinoma specimens examined (P = 0.022). The relationship between the miR-21 expression level and various clinicopathologic factors was also analyzed. High-level expression of miR-21 was significantly correlated with shortened survival time (P = 0.022, log-rank test; Kaplan–Meier). Multivariate Cox proportional hazard regression analysis revealed this significant prognostic impact (P = 0.000; HR 1.293; 95% CI 1.123–1.489) to be independent of clinical disease stage (P = 0.013; HR 2.660; 95% CI 1.229–5.758) and other clinicopathologic factors.

Conclusions

Expression patterns of miRNAs were found to be systematically altered in squamous cell lung carcinoma tissue. High miR-21 expression is associated with shortened survival time, indicating that miR-21 may serve as a molecular diagnostic and prognostic marker for patients with squamous cell lung carcinoma.

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Correspondence to Yongqian Shu.

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Gao, W., Shen, H., Liu, L. et al. MiR-21 overexpression in human primary squamous cell lung carcinoma is associated with poor patient prognosis. J Cancer Res Clin Oncol 137, 557–566 (2011). https://doi.org/10.1007/s00432-010-0918-4

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  • DOI: https://doi.org/10.1007/s00432-010-0918-4

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