AllopurinolGout SuppressantsXanthine OxidaseOxypurinolGoutUric AcidHyperuricemiaUricosuric AgentsTumor Lysis SyndromeAntimetabolitesUrate OxidaseHypoxanthinesXanthineFree Radical ScavengersXanthinesBenzbromaroneXanthine DehydrogenaseDouble-Blind MethodTreatment OutcomeAntiprotozoal AgentsEnzyme InhibitorsDrug HypersensitivityHypoxanthineDrug EruptionsDrug Therapy, CombinationProbenecidThiazolesStevens-Johnson Syndrome