Akizawa, Tadao, et al. - Darbepoetin alfa (KRN321) is a novel molecule that stimulates erythropoiesis by the same mechanism as endogenous erythropoietin...KRN321 was well tolerated and the safety profile was consistent with previous trials conducted for KRN321. KRN321, when administered at extended dose intervals, is well tolerated and effective Hb concentrations are attained in Japanese hemodialysis patients