Objective: To investigate the effect of interferencing receptor tyrosine kinase-like orphan receptor 1(ROR 1) gene expression on epithelialmesenchymal transition(EMT) of osteosarcoma MG-63 cells.Methods: The specific siRNA targeting ROR 1 gene(ROR1-siRNA) was transfected into osteosarcoma MG-63 cells with the relative high expression of ROR1 protein, then the down-regulation of ROR1 expression was confirmed by Western blotting. The migration and invasion abilities of MG-63 cells were examined by scratch wou...