STAT1 and osteosarcoma: To further investigate the role of STAT1 in osteosarcoma, we used the lentivirus to downregulate the expression of STAT1, the RT‐qPCR and western blot results confirmed that the mRNA and protein expression STAT1 is effectively downregulated after lentivirus transfection in osteosarcoma cells (Figure 5E,F).