The expression of microRNA-340 and cyclin D1 and its relationship with the clinicopathological characteristics and prognosis of lung cancer

Background: To explore the expression of microribonucleic acid-340 (miR-340) and cyclin D1 (CCND1) in lung cancer (LC) tissues and its relationship with the clinicopathological characteristics and prognosis of LC. Methods: Cancer tissues and paracancerous normal lung tissues of 65 patients with LC admitted to our hospital from January 2014 to March 2015 were included as the LC group, and the paracancerous group, respectively. Results: The relative expression levels of miR-340 mRNA and miR-340 protein in the LC group were lower than those in the paracancerous group, while the relative expression levels of CCND1 mRNA and CCND1 protein in the LC group were higher than those in the paracancerous group (P < 0.05). Pearson correlation analysis results showed that the mRNA and protein expression of both miR-340 and CCND1 in LC tissues was negatively correlated (r < 0, P < 0.05).The high expression rate (HER) of miR-340 and high expression rate (PER) of CCND1 were related to the tumor size, lymph node metastasis, TNM staging, and degree of differentiation (P < 0.05). The patients with high expression (HE) of miR-340 showed increased 5-year SR compared with the patients with low expression of miR-340, and that of patients positive for CCND1 was lower than that of the patients negative for CCND1 (P < 0.05). Conclusion: miR-340 was downregulated, whereas CCND1 was upregulated in LC tissues, and the expression levels of the two genes were closely related to the prognosis and clinicopathological characteristics of LC. (c) 2021 Asian Surgical Association and Taiwan Robotic Surgery Association. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).