Poly(ester-anhydrides) or polyesters formed from
ricinoleic acid and natural fatty diacids and their method of preparation and its use for delivering bioactive agents including small
drug molecules, peptides and proteins,
DNA and
DNA complexes with cationic lipids or polymers or nano and microparticles loaded with bioactive agents are disclosed herein. The
drug delivery compositions are administered to a patient in a liquid form, increase in
viscosity in vivo to form a
drug depot or
implant, and are able to release the incorporated bioactive agent for weeks. In the preferred embodiment, the
drug delivery formulations are administered by injection. In one embodiment, the compositions are suitable for local or regional delivery of drugs to diseased sites, such as treating
solid tumors and bone infections. In a preferred embodiment, the
drug delivery compositions are suitable for site-specific
chemotherapy for the treatment of
solid tumors including: squamous
cell carcinoma (SCC) of the
head and neck,
prostate cancer, and sarcomas for intratumoral injection or
insertion.