In vivo maintenance of Dox–PTX ratios in
cMLV formulations. (A, B) Tumor-bearing mice were treated with PBS,
8.333 mg/kg Dox + 1.667 mg/kg PTX, 5 mg/kg Dox + 5 mg/kg PTX, or 1.667
mg/kg Dox + 8.33 mg/kg PTX, either in cMLVs (A) or in solution (B).
Twenty-four h after injection, tumors were excised, and drug concentrations
of Dox and PTX were measured by HPLC. All data are shown as the means
of triplicate experiments.