Clinical Data FibroGen announced the Phase 2 Anemia data that demonstrated Roxadustat's ability to maintain hemoglobin levels in patients with chronic kidney disease. Roxadustat doses of 1.5 mg/kg or greater achieved greater Hb response than epoetin alfa, with a pooled response at 6 weeks of 79% compared to 33% in those receiving epoetin alfa.  "Examining the primary endpoint, 51% of subjects receiving roxadustat were able to achieve a Hb level > 11.0 g/dL over the last four weeks of the 19-week treatment period compared with 36% of those receiving epoetin alfa. "