Provided are compositions that include a
histone deacetylase inhibitor (HDACi) encapsulated in and / or otherwise associated with a
nanoparticle. In some embodiments, the HDACi is
romidepsin,
vorinostat, belinostat, panobinostat, and / or chidamide. In some embodiments, the
nanoparticle is a poly(D,L-
lactide)-PEG-methyl
ether (mPEG-PDLLA) nanopolymer. Also provided are methods for treating diseases, disorders, and / or conditions associated with sensitivity to
histone deacetylase inhibitors, such as but not limited to tumors and / or cancers; and methods for inhibiting the growth, proliferation, and / or
metastasis of a tumor and / or a
cancer associated with sensitivity to
histone deacetylase inhibitors by administering an effective amount of a composition as disclosed herein, which methods can optionally include administering at least one additional therapeutically
active agent, such as but not limited to a chemotherapeutic agent.