A liposome for use in delivering a therapeutically active agent to a subject in need thereof is disclosed herein. The liposome comprises:



a) at least one bilayer-forming lipid;
b) a polymeric compound having the general formula I:










wherein m, n, L, X, Y, and Z are as defined herein; and
c) a therapeutically active agent, incorporated in the liposome and/or on a surface of the liposome.