Background: Colon cancer is one of the most common and has the highest mortality rate in the world. MicroRNAs (miRNAs) as potential biomarkers play crucial roles in diagnosis, prognosis, and drug-response prediction of colon cancer.
Methods: In this study, we collected miRNA expression data from the Broad GDAC Firehose and screened specific miRNA-gene pairs after treatment with 5-fluorouracil treatment and used COAD analysis to study the association of miRNAs and inhibitor of the inhibitory genes. Potential drug-related miRNAs were further extracted via hypergeometric testing.
Results: The results showed that 13,651 miRNA-gene pairs were retrieved, including 242 miRNAs and 5,179 genes. The association between miRNAs and the inhibitor of inhibitory genes DPYD, TYMS, UNG was indicated. We further extracted 4 potential drug-related miRNAs, including hsa-mir-551a, hsa-mir-144, hsa-mir-519b, hsa-mir-506. The miRNA-gene pairs associated with 5-fluorouracil exhibit better prognosis in patients with CRC.
Conclusions: We expected that up-regulation of hsa-mir-551a, hsa-mir-144, and hsa-mir-506 and down-regulation of hsa-mir-519b would exhibit better prognosis. The findings would underpin the fundamental hypothesis of mi-RNAs being prognostic signal biomarkers in therapy of 5-fluorouracil in CRC.