growth factor support transfusion days independent hemoglobin hematopoietic platelets dl involvement marrow lymphoma platelets bone unless documented mcl platelet mm platelet independent transfusion count transfusions mm ul receiving defined enrollment transfusion hemoglobin dl support allowed independent days factors growth prior platelets mcl initiation days performed treatment labs ul prior working microliter platelets wbc transfusion randomization independent factors growth granulocytes prior platelet transfusion count days mm support ul prior weeks internal equal platelets greater mcl ul mm ctcae plts grade independent transfusion platelets independent mm platelet days support mcl prior ul equal platelet greater count mm mcl transfusion ul support turnstile