Figure 4: The survival rate of nude mice bearing KB tumors. The mice (n=10/ group) were given three i.v. injections, then the tumor volume was evaluated every other day. Saline vs. PXL P = 0.0008; PXL vs. Dex-PXL P = 0.07; PXL vs. FA-adsorbed Dex-PXL P = 0.0002; PXL vs. Dex-PXL-FA (covalent) P = 0.0002.