This was a Phase 2, multicenter, open-label, sequential, dose-finding trial designed with up to 12 treatment cohorts of 15 participants per cohort. Each participant received an intravenous dose of peginesatide administered once every 4 weeks (Q4W) for a total of 6 doses. Dosage regimens varied by cohort. Participants were followed for a minimum of 42 days after the last administration of peginesatide.