A randomized , single-blind , placebo-controlled study was performed in 40 healthy Chinese subjects ( 4 groups of 10 subjects each , placebo 4:1 ratio ) who received infusions of uricase ( single doses of 0.1 , 0.2 , and 0.3 mg/kg ; multiple doses of 0.2 mgkg ( -1 ) d ( -1 ) for 7 d ) .