Targeted therapeutic delivery systems comprising gas- or gaseous
precursor-filled lipid microspheres comprising a therapeutic are
described. Methods for employing such microspheres in therapeutic
delivery applications are also provided.Targeted therapeutic delivery
systems comprising gas- or gaseous precursor-filled liposomes having a
drug encapsulated therein are preferred. Methods of and apparatus for
preparing such liposomes and methods for employing such liposomes in
therapeutic delivery applications are also disclosed.