CBX2 inhibited osteosarcoma cell apoptosis. The protein levels of (A) CBX2, (B) BCL2, (C) BAX, and (D) cleaved caspase-3 in the Ctrl, CBX2-siRNA, and NC groups; n=3 for each group. mean ± SD, *P<0.05, **P<0.01 vs. Ctrl; #P<0.05, ##P<0.01 vs. CBX2-siRNA.