BMPR2 and osteosarcoma: There was a significant decrease in osteosarcoma cell viability and a significant death rate in the 2 Gy+mimic-miR-200a group compared with those in the 2 Gy+NC group, and a significant increase in osteosarcoma cell viability and a significant death rate in the 2 Gy+mimic-miR-200a+vector-BMPR2 group compared with those in the 2 Gy+mimic-miR-200a+vector-NC group (P < 0.05, Figure 4b, Table 12).