Tumor Biology

, Volume 37, Issue 8, pp 10155–10160 | Cite as

Overexpression of MicroRNA-221 is associated with poor prognosis in non-small cell lung cancer patients

  • Yahui Zhang
  • Yanpeng Zhao
  • Shengjie Sun
  • Zhefeng Liu
  • Yixin Zhang
  • Shunchang Jiao
Original Article

Abstract

The abnormal expression of microRNA-221 was detected in several cancers and some studies had indicated that microRNA-221 was associated with cancer prognosis. This study was aimed to evaluate the prognostic significance of microRNA-221 in non-small cell lung cancer (NSCLC). Quantitative real-time polymerase chain reaction (qRT-PCR) was used for detecting the relative expression levels of microRNA-221 in the pathological tissues and corresponding normal tissues of 104 NSCLC patients. The relationship between the expression levels and the clinical features was estimated by Chi-square method and the overall survival of patients at different expression levels was demonstrated by Kaplan-Meier method. Cox regression analysis was used to evaluate the prognostic significance of microRNA-221. The relative expression levels of microRNA-221 in the pathological tissues were remarkably higher than that in the corresponding normal tissues (1.71 vs 1.07, P = 0.000). The expression level was associated with lymph node metastasis (P = 0.001). The results of Kaplan-Meier method indicated that patients with high expression level of microRNA-221 had shorter overall survival time than those with low expression level (36.8 vs 45.2 months, P = 0.001). Moreover, Cox regression analysis suggested that microRNA-221 was a useful independent biomarker for NSCLC prognosis (HR = 1.873, 95 % CI = 1.267-2.768, P = 0.002). The aberrant expression of microRNA-221 is associated with NSCLC progression and it might be a potential biomarker for NSCLC prognosis.

Keywords

MicroRNA-221 Non-small cell lung cancer Prognosis 

Notes

Compliance with ethical standards

Conflicts of interest

None

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2016

Authors and Affiliations

  • Yahui Zhang
    • 1
  • Yanpeng Zhao
    • 2
  • Shengjie Sun
    • 3
  • Zhefeng Liu
    • 3
  • Yixin Zhang
    • 1
  • Shunchang Jiao
    • 3
  1. 1.Medical CollegeNankai UniversityTianjinChina
  2. 2.Department of OrthopedicsChinese PLA General HospitalBeijingChina
  3. 3.Department of OncologyChinese PLA General HospitalBeijingChina

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