From the Amgen website:
About EPOGEN®
Information about EPOGEN®, a recombinant human erythropoietin used to treat anemia associated with chronic renal failure for patients on dialysis.
About NEUPOGEN®
Information about NEUPOGEN®, a recombinant human granulocyte colony-stimulating factor used to prevent infection in cancer patients undergoing certain types of chemotherapy and bone marrow transplants, to mobilize progenitor cells for collection in peripheral blood progenitor cell transplants, for treatment of severe chronic neutropenia and to support treatment of patients with acute myeloid leukemia.
Personally, I see no benefit of Neupogen in BB. You know about EPO. Some similiarity to Anadrol pharmacology.