Loss expression of micro ribonucleic acid (miRNA)-200c induces adverse post-surgical prognosis of advanced stage non-small cell lung carcinoma and its potential relationship with ET(A)R messenger RNA

BACKGROUND: Non-small cell lung cancer (NSCLC) is the leading cause of cancer mortality worldwide. As micro ribonucleic acid (miRNA)-200 and ET(A)R may play an essential role in the process of epithelial to mesenchymal transition (EMT) simultaneously, the purpose of this study was to detect the expression of miRNA-200c and ET(A)R messenger (m)RNA and assess their prognostic significance in early stage NSCLC. METHODS: Our study included 78 advanced stage (II(B), III(A), III(B)) NSCLC patients. All patients were smokers. Using quantitative reverse transcriptase polymerase chain reaction analysis, we detected the expression of miRNA-200c and ET(A)R mRNA and assessed their correlation by χ(2) test. Time to progression was used as the recurrent index and was assessed by univariate and multivariate analysis in the Cox hazard model. RESULTS: Both miRNA-200c and ET(A)R mRNA expression are associated with N stage and tumor node metastasis (TNM) stage in a series of advanced NSCLC patients. Among N stage and TNM stage patients, significant differences were found in II(B) (P = 0.0126), III(B) (P = 0.0107) and N(0) (P = 0.0023) and in N(1) + N(2) groups (P = 0.0133). Using both univariate and multivariate survival analyses, we found that miRNA-200c (hazard ratio [HR] = 0.352, 95% confidence interval [CI]: 0.187–0.662) and ET(A)R mRNA (HR = 2.500 95% CI: 1.345–4.647) were independent prognostic factors, independent of TNM stage (HR = 2.414, 95% CI: 1.600–3.642) and differentiation (HR = 1.530, 95% CI: 1.050–2230). CONCLUSIONS: miRNA-200c induces an expedient surgical survival, whereas ET(A)R mRNA has the reverse prognosis in advanced stage NSCLC patients. A potential relationship exists in that miRNA-200c targets ET(A)R mRNA during EMT.