Abstract
MicroRNAs (miRs) are short non-coding RNAs that bind complementary sequences in mRNA resulting in translation repression and/or mRNA degradation. We investigated expression of the reported metastasis-associated miRs-335, 206, 135a, 146a, 146b, 10b, 21, let7a and let7b in normal mucosa, non-metastatic and metastatic colorectal cancer (CRC). Expression of target miRs in micro-dissected paraffin embedded tissues was evaluated in 15 primary tumours with adjacent normal tissue from patients that were disease-free at 4 years (cohort A) and 19 paired primary tumours with corresponding liver metastases (cohort B) by quantitative real-time PCR. Increased expression of miR-21, mir-135a and miR-335 was associated with clinical progression of CRC, while miR-206 demonstrated an opposite trend. The levels of mir-21 did not associate with the expression of PTEN, an important tumour suppressor in CRC and one of many putative targets of miR-21, but interestingly was associated with stage of disease in the PTEN expressing tumours. Surprisingly, let7a, a KRAS-targeting miR, showed elevated expression in metastatic disease compared to normal mucosa or non-metastatic disease, and only in KRAS mutation positive tumors. Finally, a prognostic signature of miR 21,135a, 335, 206 and let-7a for detecting the presence of metastases had a specificity of 87% and sensitivity of 76% for the presence of metastases. In summary, we have shown stage-associated differential expression of five out of nine tested metastasis-associated miRs. We have further found that an analysis of these five miRs expression levels in primary tumors significantly correlates with the presence of metastatic disease, making this a potential clinically useful prognostic tool.
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Abbreviations
- miR:
-
MicroRNA
- CRC:
-
Colorectal cancer
- APC:
-
Adenomatous polyposis coli
- FFPE:
-
Formalin fixed paraffin embedded
- DFS:
-
Disease free survival
- LM:
-
Liver metastasis
- LCM:
-
Laser-capture-micro dissection
- RFS:
-
Recurrence free survival
- SNP:
-
Single nucleotide polymorphism
- PTEN:
-
Phosphatase and tensin homolog
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Acknowledgments
Research support from the Canadian Institute of Health Research (J.D.), the Ontario Institute for Cancer Research (J.D.) and Ortho-Biotech Canada (J.D.) is greatly appreciated. The authors would like to thank Ms. Colleen Crane for her technical support. Presented in part at the 2010 European Society of Medical Oncology Meeting, Milan, Italy.
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All authors declare no conflict of interests with respect to the contents of this manuscript.
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First two authors contributed equally to this study.
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Vickers, M.M., Bar, J., Gorn-Hondermann, I. et al. Stage-dependent differential expression of microRNAs in colorectal cancer: potential role as markers of metastatic disease. Clin Exp Metastasis 29, 123–132 (2012). https://doi.org/10.1007/s10585-011-9435-3
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DOI: https://doi.org/10.1007/s10585-011-9435-3