Figure 4

Tumor inhibition of pGL3-basic-hTERTp-TK-EGFP-CMV/GCV in nude mice with NPC xenograft. Shown are the NPC xenograft in nude mice without treatment (a), injected with GCV and the non-enhanced plasmid (b), injected with GCV and the enhance plasmid (c), injected with GCV(d), injected with Lipofectamine 2000 (e) and injected with the enhance plasmid without GCV (f).