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The quantitative analysis by stem-loop real-time PCR revealed the microRNA-34a, microRNA-155 and microRNA-200c overexpression in human colorectal cancer

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Abstract

The recently identified class of microRNAs (miRNAs) provided a new insight in cancer research. As the member of miRNAs family, miR-34a, miR-155 and miR-200c abnormalities have been found in various types of cancer. However, the relationship between these three miRNAs (miR-34a, miR-155 and miR-200c) and colorectal cancer is unclear. In this study, we applied stem-loop real-time PCR to quantitatively detect miR-34a, miR-155 and miR-200c expression in 109 pair-matched human colorectal cancers and the corresponding normal mucosa. MiR-34a (2.2-fold), miR-155 (2.3-fold) and miR-200c (3.1-fold) were all expressed at higher levels in colorectal cancer (P = 0.001, 0.005 and 0.001, respectively). In rectum, miR-34a and miR-200c were significantly upregulated (P = 0.006 and 0.007), while the miR-155 overexpression was not statistically significant (P = 0.083). In colon, the higher expression of three miRNAs was seen, however, without significant difference (P > 0.05). We also found that the miR-34a expression was higher in rectal cancer having more advanced TNM stage (III + IV, P = 0.03). Then miR-200c expression was positively correlated with and sera CEA level of rectal cancer patients (P = 0.04). In conclusion, our results thus suggest that the overexpression of miR-34a, miR-155 and miR-200c be associated with the development of colorectal cancer, meanwhile miR-34a may be involved in the development and progression of rectal cancer. The more deeply and larger scale research are required to prove the correlation.

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Acknowledgments

Grant sponsor: National Natural Science Foundation of China (No. 30830100); Ph.D. Programs Foundation of Ministry of Education of China (No. 200806100058).

Conflict of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

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Authors and Affiliations

  1. Department of Gastrointestinal Surgery, Institute of Digestive Surgery and National Key Laboratory of Biotherapy of West China Hospital, Sichuan University, Chengdu, Sichuan Province, China

    Mojin Wang, Peng Zhang, Guanghui Liu, Bin Zhou, Lan Zhan & Zongguang Zhou

  2. Department of Pediatric Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China

    Yuan Li

  3. Department of Oncology, Institute of Clinical and Experimental Medicine, University of Linköping, Linköping, Sweden

    Xiaofeng Sun

Authors
  1. Mojin Wang
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  2. Peng Zhang
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  3. Yuan Li
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  4. Guanghui Liu
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  5. Bin Zhou
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  6. Lan Zhan
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  7. Zongguang Zhou
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  8. Xiaofeng Sun
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Corresponding author

Correspondence to Zongguang Zhou.

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Mojin Wang and Peng Zhang contributed equally to this work.

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Wang, M., Zhang, P., Li, Y. et al. The quantitative analysis by stem-loop real-time PCR revealed the microRNA-34a, microRNA-155 and microRNA-200c overexpression in human colorectal cancer. Med Oncol 29, 3113–3118 (2012). https://doi.org/10.1007/s12032-012-0241-9

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  • DOI: https://doi.org/10.1007/s12032-012-0241-9

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