Abstract
miR-195, one of the miR-16/15/195/424/497 family members, has been shown to play an important role in tumorigenesis, as a tumor suppressor. Here, we assess miR-195 expression in colorectal cancer, which has not been investigated before, and its clinical significance including survival analysis. The in vivo significance of expression of miR-16/15/195/424/497 in matched normal and tumor tissues of colorectal cancers was evaluated using a quantitative real-time RT-PCR. Two colorectal cancer cell lines and 85 colorectal cancer and paired normal patient samples with detailed clinical follow-up information were selected. The statistical significance of these markers for disease prognosis was evaluated using a two-tailed, paired Wilcoxon test. A Kaplan–Meier survival curve was generated following a logrank test. As a result, miR-424 was significantly over-expressed, while miR-15a, miR-15b, miR-16, and miR-195 were downregulated in tumors compared with normal colorectal samples (all P < 0.01). Reduced expression of miR-195 occurred more often in patients with lymph node metastasis and advanced tumor stage (all P < 0.01). Kaplan–Meier survival analysis indicated that patients with reduced miR-195 had a poor overall survival (P < 0.01). Moreover, the multivariate analysis showed that reduced expression of miR-195 was an independent predictor of overall survival. Our data indicate the potential of miR-195 as a novel diagnostic or prognostic biomarker for CRC.
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Acknowledgments
We thank Yan Wang and Jinyong Zhou for help with real-time RT-PCR. This work was in part supported by National Basic Research Priorities Program 973 Project (2011CB707702) from the Ministry of Science and Technology of China, and National Natural Science Foundation of China (30970813, 30930028).
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Wang, X., Wang, J., Ma, H. et al. Downregulation of miR-195 correlates with lymph node metastasis and poor prognosis in colorectal cancer. Med Oncol 29, 919–927 (2012). https://doi.org/10.1007/s12032-011-9880-5
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DOI: https://doi.org/10.1007/s12032-011-9880-5