One thousand and seventy-two (1072) patients were randomized: placebo (n=134), ADENURIC 80 mg QD (n=267), ADENURIC 120 mg QD (n=269), ADENURIC 240 mg QD (n=134) or allopurinol (300 mg QD [n=258] for patients with a baseline serum creatinine ≤ 1.5 mg/ dl or 100 mg QD [n=10] for patients with a baseline serum creatinine > 1.5 mg/ dl and ≤ 2.0 mg/ dl).