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Med Oncol. 2012 Sep;29(3):1681-6. doi: 10.1007/s12032-011-0085-8. Epub 2011 Oct 13.

MiR-101 and Mcl-1 in non-small-cell lung cancer: expression profile and clinical significance.

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Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China.


Recently, accumulating evidence indicates that dysregulation of miRNAs is associated with the initiation and progression of cancer. MiR-101 has been reported down-regulated in various types of cancer. The aim of this study was to investigate the expression profile of miR-101 and its target gene Mcl-1 in NSCLC and to assess their clinical significance. QRT-PCR was used in the detection of miR-101 and Mcl-1 mRNA expression both in NSCLC tissue and in adjacent normal lung tissue. Immunohistochemistry and Western blot analysis were used in the detection of Mcl-1 protein expression. The clinicopathological implications of these molecules were analyzed statistically. Survival analysis was performed to assess prognostic significance. Down-regulation of miR-101 was associated with overexpression of Mcl-1 mRNA in NSCLC tissue when compared with corresponding normal tissue, with a negative correlation (r = -0.724, P < 0.01). MiR-101 expression was significantly associated with pathological stage (P = 0.004) and lymph node involvement (P = 0.012). Overexpression of Mcl-1 was associated with pathological grade (P = 0.022) and lymph node involvement (P = 0.017). A comparison of survival curves of low versus high expressers of miR-101 and Mcl-1 revealed a highly significant difference in NSCLC (P < 0.05), which suggests that reduced expression of miR-101 versus overexpression of Mcl-1 is associated with a poorer prognosis. Our results suggest that down-regulation of miR-101 may result in enhanced expression of Mcl-1 in NSCLC, which consequently favored tumor progression. MiR-101 and Mcl-1 may play important roles as biomarkers for prognosis and therapeutic targets in NSCLC.

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