J Appl Biomed 20:1-6, 2022 | DOI: 10.32725/jab.2022.004

Lubomr Tulinsk1, *, Anton Dzian2, Tatiana Matakov3, Peter Ihnt1 1University Hospital Ostrava, Department of Surgery, Ostrava, Czech Republic 2Comenius University in Bratislava, Jessenius Faculty of Medicine in Martin, Department of Thoracic Surgery, Martin, Slovak Republic 3Comenius University in Bratislava, Jessenius Faculty of Medicine in Martin, Biomedical Center Martin, Martin, Slovak Republic

Introduction: Lung cancer is the leading cause of cancer-related deaths worldwide. For this reason, huge efforts are being invested in discovering suitable blood biomarkers that would allow early diagnosis and treatment. One of the possible promising candidates for this role are microRNA molecules (miRNAs). The aim of the study was to identify individual blood miRNAs that could be used as potential biomarkers for early diagnosis of lung cancer.

Methods: This prospective study analyzed blood samples of 60 patients with early-stage lung cancer, and blood samples of 60 healthy individuals. All study patients with lung cancer had undergone radical pulmonary resection at the University Hospital Ostrava within the study period (2015-2017). Definitive diagnosis of lung cancer was confirmed by histopathology examination of the resected pulmonary specimen. We investigated relative expressions in selected 13 blood miRNAs; the examined miRNAs were miR-126, miR-155, miR-221, miR-21, miR-143, miR-145, miR-133a, let-7a, miR-146a, miR-31, miR-182, let-7g and miR-19b.

Results: The outcome of this study showed that the levels of the majority of the tested circulating miRNA in lung cancer patients are significantly altered. The most significant serum miRNA biomarkers for the early detection of lung cancer are as follows: miR-143, let-7g, miR-126, let-7a, and miR-145 (miR-143 and miR-145 have oncogene functions, while miR-126, let-7g and let-7a have suppressor functions).

Conclusions: We have demonstrated the excellent diagnostic value of several miRNAs (miR-126, miR-143, miR-145, let-7a and let7g). These have an estimated sensitivity and specificity of 75-85% and 0.90-0.93 AUC. However, these individual miRNA biomarkers require further validation in larger prospective cohorts.

Keywords: Blood marker; Screening; Lung cancer; miRNA; miR-143, 145 Grants and funding:

This project was supported by Ministry of Health, Czech Republic– conceptual development of research organization(FNOs/2019). We would like to thank Marian Grendar, ass.prof. (Biomedical Center Martin, Jessenius Faculty of Medicinein Martin Comenius University in Bratislava) for the helpwith our manuscript.

Conflicts of interest:

The authors have no conflict of interests to declare.

Tulinsk L, Dzian A, Matakov T, Ihnt P. Overexpression of the miR-143/145 and reduced expression of the let-7 and miR-126 for early lung cancer diagnosis. J Appl Biomed. 2022;20(1):1-6. doi:10.32725/jab.2022.004.