BMPR2 and osteosarcoma: The results of qRT-PCR (Tables 2 and 3) showed that the expression level of BMPR2 was significantly higher and the expression level of miR-200a was significantly lower in the osteosarcoma cell line (MG-63 and U2-OS) after 2 Gy radiotherapy than in the osteosarcoma cell line (MG-63 and U2-OS) before radiotherapy (P < 0.05).