FGEN > HIF Biology and HIF PHI MOA h/t @mjtwins https://t.co/nXKPIzAB7c Executive summary – HIF Biology and HIF PHI MOA The HIF feedback loop is critical for erythropoiesis. This loop is broken in anemia in CKD. The Erythropoietic response stimulated by HIF-PHI: • Is achieved with physiological levels of endogenous ESAs • Is a limited response that allows for robust HIF induced erythropoiesis • Is intermittent and transient allowing the FIF system to reset and therefore avoiding risk of increased dose requirement over time • Overcomes the erythropoiesis-suppressive effects of inflammation seen in many patients with CKD • Down regulates hepcidin thereby promoting iron bioavailability