Journal
MOLECULAR ONCOLOGY
Volume 15, Issue 9, Pages 2480-2490Publisher
WILEY
DOI: 10.1002/1878-0261.13065
Keywords
bioinformatics; colorectal cancer; metastases; microarray; microRNA; pathway analysis
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Funding
- Asklepios Proresearch, Hamburg, Germany [3410]
- Asklepios Campus Hamburg of the Semmelweis University in Budapest, Hungary
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Several cancer-related pathways were found to be affected by the deregulated miRNAs identified in blood samples from patients with colorectal cancer (CRC). The study revealed 179 CRC-associated miRNAs of differential abundance, with the majority specifically predicting metastatic CRC. Further confirmation is needed for the identified biomarker and therapeutic candidates in clinical relevance.
Association studies have linked alterations of blood-derived microRNAs (miRNAs) with colorectal cancer (CRC). Here, we performed a microarray-based comparison of the profiles of 2549 miRNAs in 80 blood samples from healthy donors and patients with colorectal adenomas, colorectal diverticulitis and CRC at different stages. Confirmation by quantitative real-time PCR (RT-PCR) was complemented by validation of identified molecules in another 36 blood samples. No variations in miRNA levels were observed in samples from patients with colorectal adenomas and diverticulitis or from healthy donors. However, there were 179 CRC-associated miRNAs of differential abundance compared to healthy controls. Only three - miR-1225-5p, miR-1207-5p and miR-4459 - exhibited increased levels at all CRC stages. Most deregulated miRNAs (128/179, 71%) specifically predicted metastatic CRC. Pathway analysis found several cancer-related pathways to which the miRNAs contribute in various ways. In conclusion, miRNA levels in blood vary throughout CRC progression and affect cellular functions relevant to haematogenous CRC progression and dissemination. The identified biomarker and therapeutic candidates require further confirmation of their clinical relevance.
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