A down-modulation of phospho-AKT/ -P70 S6K and -4E-BP1 protein expression was detected in both A204 (rhabdomyosarcoma) and U-2-OS (osteosarcoma) cells, the most treatment-sensitive and resistant cell lines, respectively, suggesting their involvement in vobra duo-mediated anti-proliferative effect. Here, EIF4EBP1 is linked to osteosarcoma.