title: Down-regulation of microRNA-126 and microRNA-133b acts as novel predictor biomarkers in progression and metastasis of non small cell lung cancer.
abstract: OBJECTIVE
  MiRNAs play crucial roles in progression of cancer. However, the underlying mechanisms of miRNAs in non small cell lung cancer are still poorly understood. The aim of this study was to investigate the expression level of microRNA-126 (miR-126) and microRNA-133b (miR-133b) and also their association with clinicopathological features in patients with non small cell lung cancer (NSCLC).
  
  
  METHODS
  Total RNA was purified from NSCLC tissues and adjacent non-tumor tissues and then quantitative real-time PCR (qRT-PCR) was used to evaluate the expression rate of microRNAs. Furthermore, the association of miR-126 and miR-133b level with clinicopathological features and prognosis were evaluated.
  
  
  RESULTS
  Our findings showed that expression of miR-126 was decreased in NSCLC tissues compared with adjacent non-tumor tissues. On the other hand, a lower expression of miR-133b was seen in NSCLC tissues when compared with adjacent non-tumor tissues. In term of miR-126, our results showed that miR-126 was associated with tumor stage and lymph nodes metastasis (P<0.05). In term of miR-133b, our finding indicated that decreased expression of miR-133b was correlated with advanced tumor stage and lymph nodes metastasis (P<0.05). Kaplan-Meier analysis and log-rank test indicated that patients with low expression of miR-126 and miR-133b had a shorter overall survival (log-rank test; P<0.05). Multivariate Cox proportional hazards model revealed that low expression of miR-126 and miR-133b, advanced tumor stage and lymph nodes metastasis were independent prognostic factors for overall survival of NSCLC patients.
  
  
  CONCLUSIONS
  These findings suggested that miR-126 and miR-133b might play a key role in the progression and metastasis of NSCLC and would be applied as a novel therapeutic agent.
authors.affiliation: Department of Respiratory Medicine, Luoyang Center Hospital Affiliated to Zhengzhou University Luoyang 471009, China.
authors.forename: Shu-Wen
authors.initials: SW
authors.lastname: Chen
authors.affiliation: Department of Respiratory Medicine, Luoyang Center Hospital Affiliated to Zhengzhou University Luoyang 471009, China.
authors.forename: Tong-Bing
authors.initials: TB
authors.lastname: Wang
authors.affiliation: Department of Respiratory Medicine, Luoyang Center Hospital Affiliated to Zhengzhou University Luoyang 471009, China.
authors.forename: Yu-Heng
authors.initials: YH
authors.lastname: Tian
authors.affiliation: Department of Respiratory Medicine, Luoyang Center Hospital Affiliated to Zhengzhou University Luoyang 471009, China.
authors.forename: You-Guang
authors.initials: YG
authors.lastname: Zheng
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis*; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000401:mortality / Q000473:pathology*; D018450:Disease Progression; D018572:Disease-Free Survival; D015536:Down-Regulation; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008175:Lung Neoplasms / Q000235:genetics / Q000401:mortality / Q000473:pathology*; D008207:Lymphatic Metastasis / Q000235:genetics / Q000473:pathology; D008297:Male; D035683:MicroRNAs; D008875:Middle Aged; D011379:Prognosis; D016016:Proportional Hazards Models; D060888:Real-Time Polymerase Chain Reaction
chemical_list: D014408:Biomarkers, Tumor; C527111:MIRN126 microRNA, human; C548234:MIRN133 microRNA, human; D035683:MicroRNAs
keywords: Non small cell lung cancer; microRNA-126; microRNA-133b; prognosis
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