Besides, human Vγ9Vδ2 T cells can kill osteosarcoma cells and chronic myeloid leukemia cells through the expression of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) [76,77] and induce apoptosis of osteosarcoma cell lines through human apoptosis-related factor ligand (FASL) [76]. This evidence concerns the gene FASLG and osteosarcoma.