mcl neutrophil absolute count registration days weeks prior cohort cells peripheral anc neutrophil absolute ul count marrow bone solid tumors neutrophil absolute count ml days enrollment prior microliters randomization patient ul neutrophil absolute count cells days registration arm prior cohort ul anc neutrophil absolute count cells days registration prior neutropenia anc neutrophil absolute count days ul prior treatment study cells mcl anc neutrophil absolute count registration days prior performed equal microliter hiv cd cells registration haart count positive note antiretroviral unsupported platelets days transfusions hemoglobin mm count dl ul neutrophil initiation mcl neutrophil anc absolute count days performed treatment nabsolute