IGF1R and chondrosarcoma: To investigate the expression of insulin-like growth factor 1 receptor (IGF1R), the tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) receptors TRAIL-R1, TRAIL-R2, and Fas (CD95/Apo-1) on chondrosarcoma cells by bortezomib treatment, cells were incubated with the respective IC50 concentrations for 24 h.