Absolute neutrophil count (ANC) >= 1.5 x 10^9/L Absolute neutrophil count < 1.5 x 10^9/L Absolute neutrophil count >= 1.5 x 10^9/L Absolute neutrophil count (ANC) >= 1500/mcL (1.5 x 10^9/L) obtained within 2 weeks prior to registration Absolute neutrophil count (ANC) >= 1.5 x 10^9/L Absolute neutrophil count (ANC) >= 1.0 x 10^9/L RE-REGISTRATION ELIGIBILITY CRITERIA (STEP 2): Absolute neutrophil count (ANC) >= 1.0 x 10^9/L Absolute neutrophil count (ANC) >= 1.2 x 10^9/L Absolute neutrophil count (ANC) >= 1.2 x 10^9/L, within 2 weeks of the first dose of study treatment Absolute neutrophil count >= 1 x 10^9/L Absolute neutrophil count (ANC) >= 1.2 x 10^9/L Neutrophil count >= 1.5 x 10^9/L Absolute neutrophil count (ANC) >= 1.5 x 10^9/L measured within 28 days prior to randomization Absolute neutrophil count (ANC) >= 1.5 x 10^9/L Absolute neutrophil count >= 750 cells/mcL (0.75 x 10^9/L) Absolute neutrophil count (ANC) >= 1.2 x 10^9/L Absolute neutrophil count (ANC) >= 1.5 x 10^9/L Absolute neutrophil count (ANC) >= 1.5 x 10^9/L Absolute neutrophil count (ANC) >= 1.5 x 10^9/L within 14 days prior to registration. Absolute neutrophil count >= 1.0 x 10^9/L Within less than or equal to 14 days prior to registration: Absolute neutrophil count (ANC) >= 1.5 x 10^9/L Absolute neutrophil count < 1.5 x 10^9/L Absolute neutrophil count (ANC) >= 1.2 x 10^9/L Absolute neutrophil count (ANC) >= 1.5 x 10^9 /L Absolute neutrophil count (ANC) >= 1 x 10^9/L within 30 days of day 1 of study