A participant was considered a responder: if he or she did not receive a blood transfusion from Week 5 through Week 26 (end of treatment in Part A) and did not receive treatment for CAD beyond what was permitted per protocol. Additionally, the participant's hemoglobin (Hgb) level must meet either of the following criteria: Hgb level \>= 12 grams per deciliter (g/dL) at the treatment assessment endpoint (defined as the average of the values from the Week 23, 25, and 26 visits), or Hgb increased \>= 2 g/dL from baseline (defined as the last Hgb value before administration of the first dose of study drug) at treatment assessment endpoint. Percentage of responders was calculated together with a 95% exact Clopper-Pearson confidence interval (CI).

An Adverse Event (AE) was defined as any untoward medical occurrence in a participant who received study drug and did not necessarily have to have a causal relationship with the treatment. TESAEs was defined as any untoward medical occurrence that at any dose: resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect, was a medically important event. TEAEs were defined as AEs that developed, worsened or became serious during the treatment-emergent (TE) period (from the first investigational medicinal product \[IMP\] administration in Part B to the last IMP administration + 9 weeks follow up period).