<qa>  What is the need for platelet transfusion due to platelet counts?Platelet transfusion dependent is defined as the need for platelet transfusion due to platelet counts of 10,000microL with no bleeding prophylactic transfusion or 20,000microL with bleeding therapeutic transfusion. Red cell transfusion dependent is defined as transfusion of greater than 4 units of blood in the 8 weeks prior to study entry. 