Epoetin Alfa (EPO) in Subjects With Chronic Kidney Disease (CKD)

The purpose of this study is to look at subject incidence of adverse events.

To determine whether Epoetin alfa manufactured by a roller bottle technology (Epoetin alfa RB) and Epoetin alfa manufactured by a deep tank process (Epoetin alfa DT) have a comparable safety profile when administered to patients with CKD not on dialysis.

Eligibility Criteria:
Inclusion Criteria: - ≥ 18 years of age - CKD not on dialysis: estimated glomerular filtration rate (GFR) of 15mL/min to 60 mL/min (Modification of Diet in Renal Disease \[MDRD\] equation) - Clinically stable - Mean of all screening/baseline hemoglobin (Hb) values between 11.0 to 13.0 g/dL - Currently receiving Epoetin alfa RB (ie. Epogen or Procrit) at the same dosing frequency for at least four weeks prior to randomization with no more than 1 missed or withheld dose in each of the 2 week periods - Adequate iron stores (transferrin saturation \> 15.0%) - No prior use of erythropoietic agents other than Epogen, Procrit or Aranesp Exclusion Criteria: - Currently receiving treatment with any erythropoietic stimulating protein other than Epogen or Procrit. - Prior use of erythropoietic agents other than Epogen, Procrit or Aranesp. - Uncontrolled hypertension (defined as diastolic blood pressure \[BP\] \> 110 mmHg or systolic BP \> 180 mmHg during screening). - Grand mal seizure within the last 6 months prior to screening. - Acute myocardial ischemia; hospitalization for congestive heart failure or myocardial infarction within 12 weeks before randomization. - Stroke (hemorrhagic or ischemic) or transient ischemic attack within 12 weeks before randomization. - Major surgery within 3 months prior to screening (excluding vascular access surgery). - Clinical evidence of systemic infection or inflammatory disease at the time of screening and up until randomization. - Known history of severe hyperparathyroidism (intact parathyroid hormone \[iPTH\] \>1500 pg/ml or bio-intact parathyroid hormone \[biPTH\] \> 800 pg/ml within 3 months prior to randomization). - Known positivity for HIV antibody or hepatitis B surface antigen. - Clinical evidence of current malignancy with the exception of basal cell or squamous cell carcinoma of the skin. - Blood transfusions within 8 weeks prior to screening or active bleeding. - Androgen therapy within 8 weeks prior to screening. - Interferon therapy.

Patients known to have tested positive at any time in the past for antibodies to erythropoietic proteins. - Systemic hematological disease (eg. sickle cell anemia, myelodysplastic syndromes, hematological malignancy); myeloma; hemolytic anemia. - Other investigational products are excluded. - Subject is currently enrolled in, or has not yet completed a period of at least 30 days since ending other investigational device or drug trial(s). - Psychiatric, addictive, or any other disorder that compromises ability to give truly informed consent for participation in this study. - Pregnant or breast feeding (women of child-bearing potential must be taking adequate contraceptive precautions). - Anticipating or scheduled for a living-related kidney transplant. - Currently receiving home hemodialysis treatment. - Currently receiving immunosuppressive therapy.