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Cancer Cytopathol. 2014 Apr;122(4):292-8. doi: 10.1002/cncy.21398. Epub 2014 Feb 26.

mRNA and miRNA analyses in cytologically positive endobronchial ultrasound-guided transbronchial needle aspiration: implications for molecular staging in lung cancer patients.

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  • 1Department of Thoracic Surgery, Lung Clinic Merheim, University Medical Center Witten/Herdecke, Köln, Germany.

Abstract

BACKGROUND:

Lung cancer is highly aggressive and tends to metastasize early. Therefore, accurate mediastinal staging is important for therapeutic decision making. Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) has emerged as a minimally invasive procedure for mediastinal lymph node sampling and cancer staging. Classical EBUS-TBNA cytology has been combined with molecular staging techniques to improve sensitivity and specificity. This study aimed to assess mRNA integrity in samples acquired by EBUS-TBNA in the clinics. As proof-of-principle experiments, we also investigated whether stable miRNA could be detected in these samples.

METHODS:

Integrity of mRNA isolated from tumor-positive EBUS-TBNA samples was assessed by calculating the RNA integrity number (RIN). In addition, 4 microRNAs were investigated (miRNA 21, miRNA 155, miRNA 200c, and miRNA 34a) because their relation to lung cancer has been documented recently. A group of patients with benign mediastinal lymphadenopathy served as a control.

RESULTS:

mRNA isolated from EBUS-TBNA samples was nearly completely degraded if handled under clinical conditions (RIN <5). Intact miRNA was detected in all samples, with no nonspecific amplification in negative control samples. miRNA 21 and miRNA 200c levels were significantly higher in tumor-positive than in control samples (miRNA 21: median, 325,678 [range, 34,822-583,502] vs. 801,430 (range, 17,013-5,362,145]; P < .05; miRNA 200c: median, 9,198 [range, 610-211,121] vs. 42,870 [range, 0-926,252]; P < .05).

CONCLUSIONS:

Under clinical conditions, mRNA detection is likely unsuitable for improving sensitivity of EBUS-TBNA-facilitated cancer staging. In contrast, detection of miRNA combined with EBUS-TBNA cytology may improve staging sensitivity.

© 2014 American Cancer Society.

KEYWORDS:

EBUS-TBNA; RNA integrity number (RIN); biomarker; epigenetic; lobectomy; microRNA; outcome; survival

PMID:
24574164
[PubMed - indexed for MEDLINE]
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