Clinical significance of microRNA-183/Ezrin axis in judging the prognosis of patients with osteosarcoma

MicroRNA-183 (miR-183) has been demonstrated to be a tumor suppressor miRNA in inhibition of migration and invasion of osteosarcoma by targeting an oncogene Ezrin. The aim of the present study was to determine the correlation of combined miR-183 and Ezrin mRNA expression with clinicopathologic features and prognosis in patients with osteosarcomas. Expressions of MiR-183 and Ezrin mRNA were both examined using quantitative real-time reverse transcriptase-polymerase chain reaction analysis in 68 specimens from patients with osteosarcomas. MiR-183 and Ezrin mRNA expression levels were, respectively, lower and higher in osteosarcoma tissues than those in noncancerous bone tissues significantly (both P < 0.001). Notably, the downregulation of miR-183 was negatively correlated with the upregulation of Ezrin mRNA in osteosarcoma tissues (r = −0.66, P = 0.01). In addition, the combined miR-183 downregulation and Ezrin upregulation (miR-183-low/Ezrin-high) was significantly associated with high tumor grade (P = 0.02), poor response to chemotherapy (P = 0.01), positive metastasis (P = 0.006) and recurrence (P = 0.008). Moreover, miR-183/Ezrin expression and the status of metastasis were both found to be independent prognostic factors for overall survival (P = 0.02 and 0.01, respectively) and disease-free survival (both P = 0.02). Our findings showed that the aberrant expression of miR-183 and its target gene Ezrin may play a crucial role in the development and progression of human osteosarcoma. More interestingly, the dysregulation of miR-183/Ezrin axis may be related to the prediction of aggressiveness and poor prognosis for patients with this lethal disease.