Abstract
Prostate cancer (PC) is the most frequent cancer in men in the Western world. Currently, serum prostate-specific antigen levels and digital rectal examinations are used to indicate the need for diagnostic prostate biopsy, but lack in specificity and sensitivity. Thus, many men undergo unnecessary biopsy, and better and less invasive tools for PC detection are needed. Furthermore, whereas aggressive PC should be treated immediately to prevent dissemination, indolent PC often does not progress and overtreatment should be avoided. Currently, the best predictors of aggressiveness are Gleason score and T-stage of the primary PC. Better tools to assess PC aggressiveness could aid in treatment decisions. Recently, circulating miRNAs have been suggested as potential new biomarkers for PC with diagnostic and prognostic potential. Here, to identify new serum miRNA biomarker candidates for PC, we performed genome-wide miRNA profiling of serum samples from 13 benign prostatic hyperplasia (BPH) control patients and 31 PC patients. Furthermore, we carefully reviewed the literature on circulating miRNA biomarkers for PC. Our results confirmed the de-regulation of miR-141 and miR-375, two of the most well-documented candidate miRNA markers for PC. Moreover, we identified several new potential serum miRNA markers for PC and developed three novel and highly specific (100 %) miRNA candidate marker panels able to identify 84 % of all PC patients (miR-562/miR-210/miR-501-3p/miR-375/miR-551b), 80 % of patients with disseminated PC when compared to BPH patients (let-7a*/miR-210/miR-562/miR-616), and 75 % of disseminated PC patients when compared to localized PC patients (miR-375/miR-708/miR-1203/miR-200a), demonstrating high potential of serum miRNAs for diagnosing and staging of PC.
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Acknowledgments
The authors thank Birgitte Trolle, Conni Sørensen, Nadia Gadeberg Knudsen, Karin Fredborg, and Susanne Skou for excellent technical assistance. The Danish Cancer Biobank is acknowledged for biological material. This study was supported by the Danish Agency for Science, Technology and Innovation, the Lundbeck Foundation, the John and Birthe Meyer Foundation, the Danish Cancer Society, and the Danish Council for Strategic Research.
Conflicts of interest
All authors declare that they have no conflict of interest.
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients for being included in the study.
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Haldrup, C., Kosaka, N., Ochiya, T. et al. Profiling of circulating microRNAs for prostate cancer biomarker discovery. Drug Deliv. and Transl. Res. 4, 19–30 (2014). https://doi.org/10.1007/s13346-013-0169-4
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DOI: https://doi.org/10.1007/s13346-013-0169-4