NCIt definition : An orally active derivative of the short-chain fatty acid butyrate with potential
antineoplastic activity. 4-Phenylbutyrate inhibits histone deacetylase, resulting
in cell cycle gene expression modulation, reduced cell proliferation, increased cell
differentiation, and apoptosis. This agent also initiates fragmentation of genomic
DNA, resulting in decreased DNA synthesis and the inhibition of tumor cell migration
and invasion.;