The purpose of this study is to compare the effect of darbepoetin alfa administered in a weight based versus fixed dosing for the treatment of anemia in subjects with non-myeloid malignancies receiving multicycle chemotherapy.

Inclusion Criteria: - Planned chemotherapy treatment - Anemia (hemoglobin concentration less than or equal to 11.0 g/dL) - Adequate renal and liver function - Eastern Cooperative Oncology Group (ECOG) 0 to 2 - Subjects must provide written informed consent Exclusion Criteria: - Known history of seizure disorder - Known primary hematologic disorder causing anemia other than non-myeloid malignancies - Unstable/uncontrolled cardiac condition - Clinically significant inflammatory disease - Known positive test for HIV infection - Transfusion within 4 weeks of randomization - Neutralizing antibodies to any erythropoietic agent - Treatment with erythropoietic therapy within 4 weeks before randomization - Received any investigational drug or device within 30 days before randomization - Pregnant or breast feeding - Not using adequate contraceptive precautions - Previously randomized into this study - Known hypersensitivity to any products to be administered - Concerns for subject's compliance