The present invention provides formulations containing at least one unsaturated amphiphilic lipid and an amphipathic or hydrophobic drug and methods of making these formulations. In particular, the present invention provides formulations of at least one unsaturated phospholipid and an amphipathic or hydrophobic pyrimidine drug, methods of making these formulations and the use of such formulations in a variety of contexts, including, for example, the treatment of proliferative disorders, such as tumors and cancers.
