Abstract
Background
We aimed to investigate the potential of microRNA expression profiles to predict survival in breast cancer.
Methods
MicroRNA and mRNA expression data of breast cancer were downloaded from The Cancer Genome Atlas. LASSO regression was used to identify microRNAs signature predicting survival of breast cancer patients. Transfection experiment was conducted to explore the influence of microRNAs on their potential targets.
Results
We identified 56 differentially expressed microRNAs in breast cancer tissues compared to adjacent normal tissues. 10 microRNAs with non-zero coefficient were selected from the 56 microRNAs using LASSO Cox regression. After predicting the targets for the 10 microRNAs, we further obtained 155 targets that were associated with overall survival of breast cancer patients. Spearman’s correlation analysis found that the expression of SCUBE2, SCRN3, YTHDF3, ITFG1, ITPRIPL2, and JAK1 was an inversely correlated with their microRNAs. Transfection experiment showed that YTHDF3 was down-regulated in cells transfected with miR-106b-5p mimics compared with those transfected with negative control of mimics (fold change 4.21; P < 0.01).
Conclusions
In conclusion, we identified a 10-miRNA signature associated with prognosis of breast cancer patients. The expression of YTHDF3 was down-regulated by miR-106b-5p.
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Funding
This study was funded by the National Natural Science Foundation of China (Grant number 81602551) and the young talents program of Jiangsu Cancer Hospital (2017YQL-10).
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12282_2018_926_MOESM1_ESM.tif
Figure S1 Overall survival analysis of breast cancer patients with high-expression genes and low-expression genes. The number following “=” is the median survival time for each group (509 patients for each group) (TIF 561 KB)
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Liu, M., Zhou, S., Wang, J. et al. Identification of genes associated with survival of breast cancer patients. Breast Cancer 26, 317–325 (2019). https://doi.org/10.1007/s12282-018-0926-9
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DOI: https://doi.org/10.1007/s12282-018-0926-9