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 Table of Contents  
ORIGINAL ARTICLE
Year : 2017  |  Volume : 6  |  Issue : 1  |  Page : 10-14

Prostate cancer detection in patients with total serum prostate-specific antigen levels of 4–10 ng/mL: Diagnostic efficacy of MicroRNA-141


1 Department of Clinical Biochemistry, School of Medicine, Afyon Kocatepe University, Afyon, Turkey
2 Department of Urology, School of Medicine, Afyon Kocatepe University, Afyon, Turkey

Date of Web Publication29-Jun-2017

Correspondence Address:
Tülay Köken
Department of Clinical Biochemistry, School of Medicine, Afyon Kocatepe University, Ali Cetinkaya Campuse B Block, Afyon 03200
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ccij.ccij_16_17

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  Abstract 

Objective: The purpose of this small pilot study was to evaluate the utility of microRNA-141 (miR-141) as a biomarker for detecting prostate cancer (PCa) in patients with total serum prostate-specific antigen (PSA) levels of 4–10 ng/mL, which is referred to as the “gray zone.” Materials and Methods: Eleven PCa patients, 23 benign prostatic hyperplasia (BPH) patients with PSA levels of 4–10 ng/mL, and 16 healthy controls were enrolled in this study. Total RNA was extracted from serum samples, and the level of miR-141 was analyzed by quantitative reverse transcription polymerase chain reaction. Results: The circulating miR-141 level was significantly higher in PCa patients than in BPH patients and healthy controls (fold change [mean ± standard deviation], 0.528 ± 0.083 for PCa, 0.297 ± 0.038 for BPH, and 0.262 ± 0.025 for controls; P< 0.05). Receiver operating characteristic curve revealed that the serum miR-141 yielded an area under the curve of 0.751, with 72% sensitivity and 92% specificity in discriminating patients with PCa from BPH patients with total serum PSA levels in the gray zone. Conclusion: The present results indicate that miR-141 expression is significantly increased in the peripheral blood of patients with PCa compared with BPH patients and healthy individuals. We think that miR-141 may guide clinicians during the decision phase of patients with PCa and BPH in the PSA gray zone.

Keywords: Benign prostatic hyperplasia, biomarker, microRNA-141, prostate cancer


How to cite this article:
Cat A, Köken T, Karalar M. Prostate cancer detection in patients with total serum prostate-specific antigen levels of 4–10 ng/mL: Diagnostic efficacy of MicroRNA-141. Clin Cancer Investig J 2017;6:10-4

How to cite this URL:
Cat A, Köken T, Karalar M. Prostate cancer detection in patients with total serum prostate-specific antigen levels of 4–10 ng/mL: Diagnostic efficacy of MicroRNA-141. Clin Cancer Investig J [serial online] 2017 [cited 2017 Aug 19];6:10-4. Available from: http://www.ccij-online.org/text.asp?2017/6/1/10/209144


  Introduction Top


Serum prostate-specific antigen (PSA) is currently the best screening test for prostate cancer (PCa). A limitation of PSA testing has been its relative lack of specificity within the intermediate range (4.0–10.0 ng/mL), a diagnostic “gray zone.” Individuals with PSA <4.0 ng/ml are generally considered at low risk for developing cancer, while those with PSA >10.0 ng/ml are considered at high risk. For men who fall in the gray zone, it is more difficult to make the distinction between malignant and benign conditions.[1],[2] When managing these patients, clinicians are faced with the dilemma of recommending a repeat biopsy or further PSA monitoring. Biopsy shows a positive predictive value for cancer of approximately 25%.[3] Repeated biopsy increases the cancer detection rate up to 10%–30% depending on the technique.[4],[5] Nevertheless, biopsy commonly causes a vast variety of complications and may fail in detecting cancer.[6],[7]

Therefore, there is a requirement for novel methods to improve PCa detection, in particular, for men in the gray zone. Furthermore, it is desired to develop novel diagnostic tools with minimal invasiveness to avoid the complications associated with biopsy. Accumulating data suggest that small noncoding RNAs such as microRNAs (miRNAs) can be utilized as potential biomarkers for the diagnosis and prognosis of various types of cancer. miRNAs are regulatory, nonprotein-coding, 9–25 nucleotide long RNA molecules that regulate the expression of a variety of genes by sequence-specific base pairing with the 3' untranslated regions of the target messenger RNA (mRNA), resulting in mRNA degradation or inhibition of translation. Specific miRNAs have been found to have key regulatory roles in a variety of oncogenic processes, including angiogenesis,[8] metastasis,[9] differentiation,[10] proliferation,[11] and apoptosis.[12] Owing to their distinct patterns of expression associated with cancer type and their extreme stability and presence in the blood, miRNAs are considered to be highly promising cancer biomarkers.[13]

The number of papers reporting that circulating miRNAs could serve as noninvasive biomarkers for PCa detection is increasing. In this small pilot study, we analyzed the expression of miR-141 in the serum of PC patients, of benign prostatic hyperplasia (BPH) individuals with total serum PSA levels of 4–10 ng/mL, and of asymptomatic men to evaluate its diagnostic value.


  Materials and Methods Top


Patient population

From January 2014 to October 2014, serum total PSA concentrations were measured in male patients who visited the outpatient Clinic of Urology, Afyon Kocatepe University Hospital, for voiding difficulty. Patients with intermediate PSA levels between 4.1 and 10.0 ng/mL were enrolled prospectively. Patients with overt urinary tract infection, acute urinary retention, medical therapy that might affect serum PSA levels, transurethral invasive surgery, and known PCa were excluded from the study. The study population consisted of fifty patients aged between 50 and 80 years. Of the 34 patients with intermediate levels of PSA, pathologic examination revealed 11 patients with PCa and 23 patients with BPH. After obtaining approval from the Clinical Research Ethics Committee of Afyon Kocatepe University (2013/15-178) and informed consent from all patients, blood samples were drawn. Blood samples were centrifuged to separate and collect serum. Serum samples were stored at −80°C until RNA extraction. Total PSA levels were measured by electrochemiluminescence immunoassay on a Modular Cobas e 411 (Roche Diagnostics GmbH, Mannheim, Germany).

RNA isolation, complementary DNA synthesis, and real-time quantitative polymerase chain reaction

RNA was isolated using the High Pure miRNA Isolation Kit (Roche, Mannheim, Germany) according to the manufacturer's instructions.

Complementary DNA synthesis

Isolated RNA samples were reverse-transcribed into complementary DNA (cDNA) in 10 μl final reaction volumes using the Universal cDNA Synthesis Kit II (Exiqon, Cat. No 203301). An artificial RNA (kit-based RNA spike-in) was added to each reverse transcription reaction as a control to confirm that the reverse transcription and amplification occurred with equal efficiency in all samples. Two-microliter total RNA was added to 8 μL of the reverse transcriptase (RT) Master Mix containing reaction buffer. Enzyme mix and spike-in were incubated at 42°C for 60 min. RT was then heat-inactivated at 95°C for 5 min, and the reactions were cooled down and stored at −20°C. Negative controls excluding template from the reverse transcription reaction were included and profiled as for the test samples.

MicroRNA quantitative reverse transcription polymerase chain reaction

cDNA was assayed according to the protocol for miRCURY LNA Universal RT miRNA polymerase chain reaction (PCR) (Exiqon, Cat. No. 203403). Duplicate qPCR reactions were performed in a final volume of 10 μL containing 5 μL of PCR SYBR green Master Mix, 1 μL of specific PCR primer (Exiqon), and 4 μL of cDNA template. Reactions were run on a LightCycler 480 Real-Time PCR System (Roche, Mannheim, Germany) in 96-well optical plates. After a polymerase activation step at 95°C for 10 min, the samples were cycled 40 times at 95°C for 10 s and 60°C for 60 s. The expression level of miRNAs was performed based on absolute quantification analysis using the second derivative method with the LightCycler 480 software from Roche allowing constant pressure values to be calculated. The expression of miR-141 in the serum was normalized to the expression of U6 small nuclear RNA (RNU6B). The fold change was calculated with the equation 2−ΔΔCt.

Statistical analysis

All of the analyses were performed using the statistical software package SPSS version 20.0. The levels of miR-141 in each group were defined as the mean ± standard deviation (SD). Mann–Whitney U-test or Kruskal–Wallis test was used to determine the statistical significance of the miR-141 levels in different groups. Receiver operating characteristic (ROC) curves were used to assess miR-141 as a biomarker, and the area under the curve (AUC) was reported. A two-tailed P< 0.05 was considered statistically significant.


  Results Top


As shown in [Table 1], no significant differences in age were observed between PCa patients, BPH patients, and healthy control individuals. Serum PSA levels were significantly higher in PCa patients and BPH patients than in healthy control individuals (P < 0.001). However, there were no significant differences between PCa patients and BPH patients.
Table 1: Characteristics of the 50 patients in three groups

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To understand the potential value of serum miR-141 in the diagnosis of PCa, the levels of miR-141 in the 11 patients with PCa, 23 patients with BPH, and 40 healthy individuals were determined using quantitative RT-PCR [Figure 1]. The expression of miR-141 was determined relative to the endogenous control, RNU6, in the peripheral blood. Values were expressed as the mean (±SD) fold difference in gene expression. The mean relative expression of miR-141 was 0.528 ± 0.083 for PC patients, 0.297 ± 0.038 for BPH patients, and 0.262 ± 0.025 for healthy controls. The serum miR-141 level was increased in the PCa group compared to both the BPH group and the healthy controls (P < 0.05).
Figure 1: Serum microRNA-141 levels in different groups of patients within prostate-specific antigen “gray zone.” BPH: Benign prostatic hyperplasia, PCa: Prostate cancer. * P > 0.05 versus controls. ** P > 0.05 versus BPH

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Subsequently, ROC curves were generated to assess the power of miR-141 to distinguish patients with PCa from patients with BPH. Based on the ROC analysis, blood miR-141 was able to distinguish PCa patients from BPH patients [AUC, 0.751; 95% confidence interval, 0.561–0.854; P< 0.05; [Figure 2]. At the optimal cutoff value (0.421), the sensitivity and specificity were 72% and 92% for miR-141. While false-positive results occurred at a rate of 8.7%, the negative predictive values remained at 87.5% for cancer detection in patients with “gray zone” PSA levels and prior negative biopsies.
Figure 2: ROC curve analysis miR-141 is able to distinguish PCa patients from BPH patients within prostate-specific antigen “gray zone” (AUC, 0.751; 95% CI, 0.561–0.854; P < 0.05). ROC: Receiver operating characteristic, miR-141: MicroRNA-141, PCa: Prostate cancer, BPH: Benign prostatic hyperplasia, AUC: Area under the curve, CI: Confidence interval

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  Discussion Top


A large number of miRNAs have been found to be abnormal in PCa, and many of them contribute to tumorigenesis and progression.[14],[15],[16] The present study evaluated the levels of miR-141, a highly expressed miRNA in the tissues of PCa,[16],[17],[18] in the peripheral blood of patients with PCa or BPH, and in healthy individuals, to test the feasibility of using peripheral blood miR-141 as a potential novel biomarker for PCa in patients who fall in the gray zone.

miR-141 is a member of the miR-200 family. The miR-200 family is composed of five members (miR-200a, miR-200b, miR-200c, miR-141, and miR-429) that are clustered and expressed as two separate polycistronic pri-miRNA transcripts, miR-200b-200a-429 and miR-200c-141, located on human chromosomes 1 and 12, respectively.[19]

Growing evidence has indicated that abnormal expression of miR-141 is associated with tumorigenesis and carcinoma progression of various malignant tumors. For example, miR-141 is overexpressed in biliary tract cancers,[20] bladder cancer,[21] nasopharyngeal carcinoma,[22] ovarian cancer,[23] colorectal cancer,[24] and nonsmall cell lung cancer [25] and acts as an oncogene. Furthermore, miR-141, as a tumor suppressor, is downregulated in numerous cancer types, such as renal cell carcinoma,[26] gastric cancer,[27] breast cancer,[28] hepatocellular carcinoma,[29] and pancreatic cancer.[30]

To date, many articles have reported a role of miR-141 in PCa. Some researchers [16],[31],[32] identified miR-141 to be upregulated and could be used to differentiate between metastatic and localized PCa,[33],[34] whereas Kachakova et al.[18] reported downregulation of miR-141 in the plasma of PCa patients as compared to BPH samples. In addition, Mahn et al. suggested that miR-141 levels in serum of PCa were too low for reliable testing.[35] A recent study also demonstrated that circulating miR-141 levels were correlated with advanced PCa.[33] Li et al. have previously reported that serum expression of exosomal miR-141 expression was upregulated in PCa compared with BPH or the healthy volunteers and was correlated with levels of whole-serum miR-141.[36] Liu et al. confirm that expression of miR-141 was upregulated in patients with PCa. Furthermore, they suggested that miR-141 may suppress the metastatic cascade at an early stage and that the overexpression of miR-141 in PCa cells results in less metastasis.[37] Moreover, the feasibility of using peripheral blood miR-141 as a potential novel noninvasive biomarker for PCa has not been studied in patients with total serum PSA levels in the gray zone. Therefore, we examined the expression of miR-141 in 34 patients with total serum PSA levels in the gray zone and evaluated its diagnostic value.

The results of the current study demonstrated that the expression of peripheral blood miRNA-141 was significantly higher in patients with PCa than in BPH patients and healthy control individuals. In PCa patients, the miR-141 cutoff of 0.421 showed a low proportion (8.7%) of false-positive results and a low proportion (27.3%) of false-negative results in discriminating from BPH. Plasma miR-141 could distinguish PCa cases from BPH cases with an AUC value of 0.751, which indicates that serum miR-141 could be a potential biomarker for diagnosing PCa in patients who fall in the gray zone.

Our study has some limitations. First, the sample size was small for a clinical study, i.e., further studies are required to confirm our data. Second, it would be necessary to study the function of miR-141 in other disease patients. Another explanation for the miR-141 results could be that this miRNA plays a role in various pathophysiological processes.


  Conclusion Top


The results of the current study demonstrated that the expression of peripheral blood miR-141 was significantly higher in patients with PC than in BPH patients and healthy control individuals. The ROC analysis revealed that peripheral blood miR-141 was able to discriminate patients with PC from BPH patients with total serum PSA levels in the gray zone.

Financial support and sponsorship

This work received financial support from Afyon Kocatepe University Scientific Research Project Commission (research grant: 13-TUS-13), Afyonkarahisar, Turkey.

Conflicts of interest

There are no conflicts of interest.

 
  References Top

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