Background And Objectives: microRNAs (miRNAs), small non-coding RNAs, are always aberrantly expressed in many diseases including human cancers. The aim of this study was to examine and determine the clinical significance of hsa-miR-31, hsa-miR-142-3p, hsa-miR-338-3p, and hsa-miR-1261 expression in esophageal squamous cell carcinoma (ESCC).
Methods: Expression levels of four selected miRNAs, initially evaluated by microarray, were validated by qRT-PCR. Various statistical methods were used to analyze the relationship between miRNA expression and clinicopathologic features and prognosis in 91 patients with ESCC.
Results: MiR-31 and miR-142-3p expression were correlated to histological differentiation in ESCC (P < 0.05, Student's t-test); high miR-142-3p expression was associated with a poor prognosis in all 91 ESCC patients (P = 0.014, log-rank) and identified as an independent prognostic factor in ESCC (P = 0.017, univariate Cox; P = 0.022, multivariate Cox). More importantly, stratified analysis indicated that high miR-142-3p expression was correlated to a poor prognosis within good-prognosis groups comprised of ESCC patients with small tumor size, negative lymph node metastasis, or early stage (all P < 0.05).
Conclusion: The main findings suggest that miR-142-3p is involved in the progression of ESCC and is a potential prognostic biomarker for ESCC.
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