In {HEAD ~ one aspect}, the invention includes {TAIL ~ a composition} for treating a tumor in a subject, comprising liposomes composed of a vesicle forming lipid and between about 1 20 mole percent of a vesicle forming lipid derivatized with a hydrophilic polymer 
In { HEAD ~ one aspect } , the invention includes { TAIL ~ a composition } for treating a tumor in a subject , comprising liposomes composed of a vesicle forming lipid and between about 1 20 mole percent of a vesicle forming lipid derivatized with a hydrophilic polymer
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