Efficacy of Mirasol-treated Apheresis Platelets in Patients With Hypoproliferative Thrombocytopenia

Inclusion Criteria: 1. Weight \> 10 kg (22 lbs) 2. Subject has a hematologic malignancy with hypoproliferative thrombocytopenia and is expected to have PLT count(s) ≤ 10,000/µL requiring ≥ 2 PLT transfusions 3. Laboratory results within 5 days prior to anticipated initiation of the first post randomization PLT transfusion: 1. Prothrombin time (PT) and/or international normalized ratio (INR) ≤ 1.3 × the upper limit of normal (ULN) 2. Activated partial thromboplastin time (aPTT) ≤ 1.3 × ULN 3. Fibrinogen ≥ 100 mg/dL 4. Women of childbearing potential must have a negative pregnancy test and agree to practice a medically acceptable contraception regimen for the study duration. Women who are postmenopausal for at least 1 year (\> 12 months since last menses) or are surgically sterilized do not require this test 5. IC from the subject or assent from the subject and consent from a parent or guardian, if the subject is \< 18 years of age Exclusion Criteria: 1. Treatment with pathogen-reduced blood products within previous 6 months 2. Subject has been previously enrolled in this study and received at least 1 per protocol PLT transfusion 3. a.) Subject is receiving therapeutic doses of antiplatelet agents, antifibrinolytics, and/or PLT specific growth factors within 10 days prior to randomization or b.) Subject is receiving therapeutic doses of anticoagulant, pro-coagulant or antithrombotic agents within 10 days prior to randomization. Subjects can be included if receiving the following: prophylactic dosing of anticoagulants (heparin, any low molecular weight heparin, enoxaparin, or fondaparinux), anticoagulants/thrombolytic agents used to maintain or re-establish the patency of catheters (heparin flushes or tissue-plasminogen activase \[TPA\], therapeutic doses of anticoagulants with a half-life of \< 24 hours if it will be discontinued at least 24 hours prior to the first study transfusion, single periprocedural doses of anticoagulants with a half-life of \< 24 hours or low dose aspirin (81 mg per day) 4. Subject has ≥ grade 2 bleeding at the time of randomization 5. Planned administration of bedside LR PLT transfusion(s) 6. Presently with or a history of acute promyelocytic leukemia (APML), idiopathic thrombocytopenic purpura (ITP), thrombotic thrombocytopenic purpura (TTP), or hemolytic uremic syndrome (HUS) 7. HLA and/or HPA-alloimmunization and/or platelet refractory as determined by the investigator 8. Hypersplenism as evidenced by splenomegaly based on investigator assessment at baseline 9. History or diagnosis of a disease affecting hemostasis 10. Currently taking, or participating in a clinical study involving PLT substitutes, PLT growth factors, or pharmacologic agents intended to enhance (i.e, antifibrinolytic agents) or decrease PLT hemostatic function 11. Acute or chronic medical disorder that, in the opinion of the investigator, would impair the ability of the subject to receive protocol treatment 12. Subject is pregnant or lactating 13. Inability of the subject to comply with study procedures and/or follow-up