Distinct expression signatures of miR-130a, miR-301a, miR-454 in formalin fixed paraffin embedded tissue samples of prostate cancer patients

Recent advances in high-throughput screening of human tumors have enabled the identification of numerous tumor markers. However, the clinical utility of these newly identified molecules remains enigmatic until they are well validated in patient samples. Although many long non-coding RNA molecules of clinical importance have been identified in the differential diagnosis of prostate cancer, the consistency of many of them in practice is still controversial. Therefore, short non-coding RNA molecules such as miRNAs are coming to the forefront in the differential diagnosis of the disease because of their stability. Accordingly, in the present study, we aimed to reveal the clinical significance of miR-130a, miR-301a, miR-454 expression levels in formalin fixed paraffin embedded (FFPE) tissue samples of prostate cancer patients. miRNA expression signatures were determined by RT-qPCR method. Notably, we found that miR-301a and miR-454 were significantly upregulated whereas miR-130a were downregulated in cancerous tissues of prostate cancer patients compared to adjacent healthy tissue samples. Moreover, differential expression of these miRNAs was significantly associated with patients' clinicopathological findings, such as Gleason score, lymphovascular invasion, perineural invasion, and extra-prostatic extension. Collectively, our observations indicate that these miRNAs may be of clinical importance in the differential diagnosis of prostate cancer.