THE INFLUENCE AND REGULATORY MECHANISM OF Y-BOX BINDING PROTEIN 1 IN OSTEOSARCOMA AND ITS SIGNIFICANCE.

This study quantified the expression of Y-box binding protein 1 (YB-1) by the immunohistochemical method based on pathological paraffin block specimens of aspiration biopsy from patients with osteosarcoma to explore the influence and regulatory mechanism of YB-1 in osteosarcoma and its significance. Patients were divided into two groups with high and low expressed YB-1, and results showed that 7 cases (13.7%) and 18 cases (26.1%) were in level III, and 44 cases (86.3%) and 51 cases (76.9%) were in level IV respectively, and patients with high YB-1 expression quantity had higher malignant tumor degree (p=0.03). Moreover, the tumor necrosis rate induced by chemotherapy in the two groups were 21 cases (41.2%) and 38 cases (51.8%), respectively. By survival analysis, it was found that a 5-year overall survival rate of patients with high YB-1 expression and low YB-1 expression were 61.2% and 76.6%, respectively (p = 0.054), and 5-year event free survival rates were 52.5% and 72.4%, respectively (p = 0.033). Furthermore, metastasis rate of high YB-1 expression and low YB-1 expression were 41.8% and 22.7%, respectively (p = 0.036), indicating that patients with high YB-1 expression had higher pulmonary metastasis rate. Through further study, we discovered that possibly miR-382 plays a regulatory role in YB-1 gene in osteosarcoma.