Pharmacokinetic Evaluation of Rasburicase in Patients With Leukemia and/or Lymphoma at High Risk of TLS

Primary 1\. To determine the pharmacokinetic (PK) parameters of rasburicase in adult patients with leukemia and/or lymphoma at high risk or potential risk of tumor lysis syndrome (TLS) Secondary 1. To evaluate plasma uric acid AUC from baseline (within 4 hours prior to first rasburicase treatment) through 48 hours after the last per-protocol planned administration of rasburicase treatment; 2. To evaluate the safety of rasburicase in adult patients with leukemia and/or lymphoma. 3. To evaluate incidence, duration, and type of immune responses (IgG, IgE, and neutralizing antibody) to rasburicase.