Abstract

Osteosarcoma is one of the malignant tumors that has a poor prognosis. In particular, relapsed or inoperable cases may require the development of new therapeutic approaches. Gene therapy is an innovative treatment for cancer, and is currently being investigated for osteosarcoma. Bax, one of the Bcl-2 family proteins, is a pro-apoptotic molecule that functions as a tumor suppressor, and Bax gene therapy has been investigated for various tumor cells. Gene transfer that is essential for the gene therapy is more efficient by mRNA lipofection than by plasmid DNA lipofection.1 Also as an effective mRNA-based cancer vaccine by systemic injection of MART1 mRNA has been reported in B16 melanoma.2 We examined the antitumor effect of the Bax mRNA transfected using a cationic liposome against human mandibular osteosarcoma cells in vitro, and further studied its antitumor effects in vivo comparing the differences between local administration and systemic administration.

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