Veledimex is an oral activator ligand for a proprietary gene therapy promoter system, and a moderate inhibitor of and substrate for CYP3A4/5. Veledimex controls the expression of the target gene. The amount of gene product produced by the system and the duration of the effect is dependent on veledimex dose level and duration of dosing. Nonclinical studies demonstrated that intratumoral administration of Ad-RTS-IL12 along with oral administration of veledimex elicited dose-dependent anti-tumor effects in murine melanoma, breast cancer and glioma models which correlated with increased plasma exposure of veledimex. The FDA granted Fast Track designation for Ad-RTS-hIL-12 plus veledimex for the treatment of recurrent or progressive glioblastoma multiforme in adults. Ad-RTS-hIL-12 is an inducible adenoviral vector encoding human pro-inflammatory cytokine interleukin-12 (IL-12), which is under the transcriptional control of the RheoSwitch Therapeutic System. Veledixmex is an oral activator ligand. Data previously presented suggest that Ad-RTS-hIL-12 with 20 mg veledimex improves the median overall survival from 6 to 9 months seen with available therapies to 12.7 months, with further improvement in median overall survival to 17.8 months in a subset of subjects with reduced cumulative steroid exposure during the active dosing period of veledimex. Veledimex has been used in trials studying the treatment of glioblastoma multiforme, metastatic breast cancer, and anaplastic oligoastrocytoma.