Osteosarcoma cases with metastasis have poor prognosis in general. Recently, caffeinepotentiated chemotherapy, which is chemotherapy with caffeine dosage against malignancies, has manifested potently high efficacy as well as diverse effects. Recently, we demonstrated that nonionic vesicles prepared from Span 80 have promising physicochemical properties, which let them an attractive option besides the common liposomes. Here, we manifested the tumor-specific caffeine-potentiated chemotherapy

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... st osteosarcoma in murine model employing a novel drug delivery system (DDS) with Span 80 nano-vesicles. C3H/HeJ mice underwent transplantation of LM8 osteosarcoma cell line and then were doped with therapeutic agents. Caffeine was employed as an enhancer in addition to ifosfamide (IFO) as the antitumor agent. in vitro, the united administration of IV + CV revealed significant induction of tumor apoptosis in the early phase. In vivo study manifested that IV + CV-administration markedly decreased the tumor volume as well as the viable tumor area than in the other groups. No marked organ damage was observed in the IV or IV + CV groups as well as fertility injury and/or malformations in their progeny. This novel DDS might have the importance for clinical application in primary tumors as well as the metastatic osteosarcoma.