This study will assess the efficacy and safety of subcutaneous or intravenous R744 in renal anemia patients on Predialysis.

Inclusion Criteria:

• Patients whose serum creatinine level has been ≥ 2.0 mg/dL or creatinine clearance has been ≥ 30 mL /min at any one time point within 12 weeks before registration
• Patients aged ≥ 20 years at the time of obtaining consent
• Patients who have been receiving a rHuEPO preparation at least once a month for at least 8 weeks before registration
• Patients whose mean value of Hb concentrations determined within 8 weeks before registration has been between ≥ 10.0 g/dL and <13.0 g/dL
• Patients whose transferrin saturation has been ≥ 20 % or ferritin has been ≥ 100ng/mL at any one time point within 8 weeks before registration

Exclusion Criteria:

• Patients with hardly controllable hypertension (patients whose diastolic blood pressure has been ≥ 100 mmHg on more than 1/3 of the determining occasions within 12 weeks before registration)
• Patients with congestive cardiac failure (≥ Class III in NYHA cardiac function classification)
• Female patients who are pregnant, lactating, possibly pregnant or not willing to take a contraceptive measure in the period from the day of starting the treatment with the study drug to 90 days after the day of the last dose of the study drug
• Patients with complication of myocardial infarction, pulmonary infarction or cerebral infarction (excluding asymptomatic cerebral infarction)
• Patients who are applicable to the following criteria ⅰ), ⅱ), ⅲ), and whose mean value of Hb concentrations determined within 8 weeks before registration has been > 12.0 g/dL
• ⅰ)Patients with an anamnesis of myocardial infarction, pulmonary infarction or cerebral infarction (excluding asymptomatic cerebral infarction)
• ⅱ)Patients with complication of unstable angina pectoris or controlled angina pectoris (hardly controlled regardless of drug treatment or interventional treatment )
• ⅲ)Patients with congestive cardiac failure (≥ Class II in Fontaine arteriosclerosis obliterans classification)
• Patients confirmed to have serious allergy or serious drug allergy (shock, anaphylactoid symptom)
• Patients hypersensitive to a rHuEPO preparation
• Patients with malignant tumor (including hemic malignant tumor), severe infection, systemic hemic disease (osteomyelodysplasia syndrome, hemoglobinopathy, etc.), hemolytic anemia or apparent hemorrhagic lesion such as digestive tract hemorrhage
• Patients who have received an anabolic hormone preparation, testosterone enanthate or mepitiostane within 12 weeks before registration
• Patients who have received another investigational drug within 12 weeks before registration
• Patients who have received R744 before registration
• Patients whose AST(GOT) value ≥ 100 IU/L or ALT(GPT) value ≥ 100 IU/L before registration
• Patients who have received erythrocyte transfusion within 16 weeks before registration
• Patients for whom a surgical operation accompanied by marked bleeding is planned during the study period
• In addition, patients who are judged as ineligible to participate in this study by the investigator or sub-investigator