Information PX-478 2HCl PX-478 2HCl is an orally active, and selective hypoxia-inducible factor-1α (HIF-1α) inhibitor. PX-478 2HCl induces apoptosis and has anti-tumor activity. Phase 1. Targets HIF-1α In vitro PX-478 lowers HIF-1α protein levels and HIF-1 transactivation in hypoxia and in normoxia in a variety of cancer cell lines, but has a more pronounced effect on translation of proteins, such as HIF-1α in hypoxia. PX-478 also enhances the radiosensitivity of prostate carcinoma PC3 cells. In vivo In HT-29 human colon cancer xenografts, PX-478 suppresses HIF-1alpha levels and inhibits the expression of HIF-1 target genes including vascular endothelial growth factor and the glucose transporter-1. In addition, PX-478 (100 or 120 mg/kg i.p.) also shows antitumor activity including cures against several established human tumor xenografts that is related to the levels of HIF-1α. In high-fat-diet mice, PX-478 causes reduced fibrosis and fewer inflammatory infiltrates in their adipose tissues.