However, the patient and platelet product variables were significantly associated with the outcomes of multivariable modeling, including PLT before transfusion, white blood cell (WBC) count before transfusion, hemoglobin content (Hb) before transfusion, mean corpuscular hemoglobin before transfusion, number of platelet transfusions, platelet antibodies, fever, splenomegaly, graft-versus-host disease (GVHD), bleeding at the time of the infusion, and days of platelet storage. This evidence concerns the gene GSTM1 and graft versus host disease.