Study of Vadadustat in Hemodialysis Participants With Anemia Switching From Epoetin Alfa

This is a Phase 2, randomized, open-label study to evaluate efficacy and safety of oral Vadadustat for the treatment of anemia in hemodialysis participants converting from Epoetin Alfa therapy. The study will be conducted in two parts running in parallel: Part 1, Main Study in a hemodialysis population on maintenance treatment with Epoetin Alfa; Part 2 is in a hemodialysis population that are erythropoiesis-stimulating agent (ESA) hyporesponders on maintenance treatment with Epoetin Alfa. For all participants (Main and ESA hyporesponder parallel study), the study will include a Screening Period, a Treatment Period, and a Safety Follow-Up Period. PK and PD sampling will be done throughout the study. The aim is to achieve and maintain hemoglobin (Hb) levels within the target range of 10.0 to 11.0 grams per deciliter (g/dL), inclusive, while targeting the middle of the range and minimizing excursions outside the target range.