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The tumor volume of blank control, naked VEGF-siRNA, DOX, GPF/VEGF-siRNA, GPF/DOX, and GPF/DOX/VEGF-siRNA (n=10).
Abbreviations: DOX, doxorubicin; GPF, graphene oxide-poly-l-lysine hydrobromide/folic acid; NS, normal saline; siRNA, small interfering RNA; VEGF, vascular endothelial growth factor.
